A251198 Number of (n+1)X(5+1) 0..1 arrays with no 2X2 subblock having the minimum of its diagonal elements less than the absolute difference of its antidiagonal elements

421, 4172, 49104, 599869, 7392190, 91120318, 1123772109, 13857491196, 170891121600, 2107379861537, 25987915305133, 320477652481276, 3952074277982088, 48736235840108773, 601006370941302525

Offset

1,1

Comments

Column 5 of A251201

Links

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

Formula

Empirical: a(n) = 2*a(n-1) +118*a(n-2) +279*a(n-3) -1792*a(n-4) -3874*a(n-5) +13807*a(n-6) +15815*a(n-7) -60874*a(n-8) -9844*a(n-9) +120750*a(n-10) -46021*a(n-11) -141005*a(n-12) +176283*a(n-13) -34545*a(n-14) -57511*a(n-15) +27381*a(n-16) +6840*a(n-17) -5394*a(n-18) +98*a(n-19) +271*a(n-20) -11*a(n-21) -4*a(n-22) for n>25

Example

Some solutions for n=3
..1..0..1..0..1..1....1..0..1..1..1..1....0..0..1..0..1..1....1..0..1..1..1..1
..1..1..1..1..1..1....0..1..1..1..1..1....0..1..1..1..0..1....0..1..0..1..1..1
..1..1..0..1..1..1....1..1..1..1..1..0....1..0..1..0..1..0....1..1..1..0..1..0
..1..0..1..0..1..1....0..1..1..1..1..1....0..1..1..1..1..1....0..1..0..1..1..1

Crossrefs

Sequence in context: A302284 A353045 A302732 * A302533 A303414 A242149

Adjacent sequences: A251195 A251196 A251197 * A251199 A251200 A251201

Keyword

nonn

Author

R. H. Hardin, Nov 30 2014

Status

approved