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A263367 Number of (n+1)X(2+1) 0..2 arrays with each row and column divisible by 7, read as a base-3 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 (list; graph; refs; listen; history; text; internal format)
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(n-1) +101*a(n-6) -404*a(n-7) -2159*a(n-12) +8636*a(n-13) +2059*a(n-18) -8236*a(n-19)

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

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Last modified December 2 08:31 EST 2021. Contains 349437 sequences. (Running on oeis4.)