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A250969 Number of (n+1)X(4+1) 0..1 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
604, 12281, 249921, 5089900, 103684186, 2112130109, 43025963570, 876479703950, 17854730951799, 363717955042320, 7409282841342444, 150934183848595064, 3074673806193093731, 62634048639412217021, 1275915526747412367745 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A250973

LINKS

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

FORMULA

Empirical: a(n) = 32*a(n-1) -322*a(n-2) +2227*a(n-3) -12086*a(n-4) +47762*a(n-5) -142463*a(n-6) +321616*a(n-7) -516143*a(n-8) +570208*a(n-9) -437734*a(n-10) +223620*a(n-11) -61118*a(n-12) +2048*a(n-13) -581*a(n-14) +2307*a(n-15) -712*a(n-16) +60*a(n-17)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A321269 A234343 A234338 * A265244 A228036 A274765

Adjacent sequences:  A250966 A250967 A250968 * A250970 A250971 A250972

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

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Last modified January 22 07:31 EST 2022. Contains 350481 sequences. (Running on oeis4.)