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A253539 Number of (n+2)X(3+2) 0..1 arrays with every 3X3 subblock diagonal maximum minus antidiagonal minimum nonincreasing horizontally and nondecreasing vertically 1
20480, 317696, 4414976, 57759744, 751577856, 9765667072, 127181862144, 1653182428416, 21497916851456, 279447917432064, 3633216194866432, 47229024750114048, 613976442965898496, 7981277938053733632 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A253544

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) -11*a(n-2) -693*a(n-3) +3244*a(n-4) -19932*a(n-5) +46560*a(n-6) +261248*a(n-7) -776832*a(n-8) +664576*a(n-9) -1263616*a(n-10) -15355904*a(n-11) +39215104*a(n-12) +46170112*a(n-13) -132120576*a(n-14) +1835008*a(n-15) +86507520*a(n-16) -117440512*a(n-17) +176160768*a(n-18) +16777216*a(n-19) -167772160*a(n-20) +67108864*a(n-21)

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Sequence in context: A186060 A253866 A253873 * A178585 A187282 A235836

Adjacent sequences:  A253536 A253537 A253538 * A253540 A253541 A253542

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2015

STATUS

approved

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Last modified May 25 11:40 EDT 2022. Contains 354067 sequences. (Running on oeis4.)