

A263367


Number of (n+1)X(2+1) 0..2 arrays with each row and column divisible by 7, read as a base3 number with top and left being the most significant digits.


1



1, 2, 7, 29, 112, 367, 1359, 5370, 21447, 86013, 343936, 1371301, 5479081, 21913562, 87653287, 350634149, 1402534912, 5609859607, 22439049159, 89756056050, 359024196327, 1436098422693, 5744393762896, 22977556193101, 91910198451361
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OFFSET

1,2


COMMENTS

Column 2 of A263373.


LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210


FORMULA

Empirical: a(n) = 4*a(n1) +101*a(n6) 404*a(n7) 2159*a(n12) +8636*a(n13) +2059*a(n18) 8236*a(n19)


EXAMPLE

Some solutions for n=4
..0..2..1....0..0..0....0..2..1....0..0..0....1..1..2....0..2..1....0..2..1
..0..2..1....2..1..0....2..1..0....0..0..0....2..1..0....0..0..0....1..1..2
..0..0..0....1..1..2....0..0..0....2..1..0....0..0..0....0..0..0....0..0..0
..0..2..1....0..2..1....0..2..1....1..1..2....1..1..2....0..2..1....0..2..1
..0..2..1....0..0..0....2..1..0....0..2..1....2..1..0....0..0..0....1..1..2


CROSSREFS

Cf. A263373.
Sequence in context: A199581 A289609 A278815 * A120757 A134169 A052961
Adjacent sequences: A263364 A263365 A263366 * A263368 A263369 A263370


KEYWORD

nonn


AUTHOR

R. H. Hardin, Oct 16 2015


STATUS

approved



