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A263796 Number of (n+1)X(5+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nonincreasing 1
4, 4, 14, 17, 61, 130, 494, 1435, 4917, 13962, 41366, 107284, 280438, 666212, 1574783, 3468753, 7560914, 15618901, 31856173, 62297164, 120205886, 224230549, 412782291, 739028663, 1306513751, 2256420867, 3851037496, 6442700456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A263799

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +18*a(n-2) -18*a(n-3) -153*a(n-4) +153*a(n-5) +816*a(n-6) -816*a(n-7) -3060*a(n-8) +3060*a(n-9) +8568*a(n-10) -8568*a(n-11) -18564*a(n-12) +18564*a(n-13) +31824*a(n-14) -31824*a(n-15) -43758*a(n-16) +43758*a(n-17) +48620*a(n-18) -48620*a(n-19) -43758*a(n-20) +43758*a(n-21) +31824*a(n-22) -31824*a(n-23) -18564*a(n-24) +18564*a(n-25) +8568*a(n-26) -8568*a(n-27) -3060*a(n-28) +3060*a(n-29) +816*a(n-30) -816*a(n-31) -153*a(n-32) +153*a(n-33) +18*a(n-34) -18*a(n-35) -a(n-36) +a(n-37)

EXAMPLE

Some solutions for n=5

..1..1..1..1..0..0....1..1..1..1..0..0....1..1..1..1..0..0....1..1..1..1..1..1

..1..1..1..1..0..0....1..1..0..0..1..1....1..1..0..0..0..0....1..1..1..1..1..1

..1..1..1..1..0..0....1..0..1..0..1..0....1..0..1..0..1..0....1..1..1..1..0..0

..1..1..1..1..0..0....1..0..0..1..0..0....1..0..0..1..1..1....1..1..1..1..0..0

..1..1..0..0..1..1....0..1..1..0..1..1....0..0..1..0..0..1....1..1..0..0..0..0

..1..1..0..0..1..1....0..1..0..0..1..0....0..0..0..0..0..0....1..1..0..0..0..0

CROSSREFS

Cf. A263799

Sequence in context: A097335 A255297 A263870 * A263871 A263797 A174406

Adjacent sequences:  A263793 A263794 A263795 * A263797 A263798 A263799

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 26 2015

STATUS

approved

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Last modified March 24 06:56 EDT 2019. Contains 321444 sequences. (Running on oeis4.)