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A250976 Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
562, 12077, 260056, 5598430, 120515358, 2594308975, 55847243498, 1202213827627, 25879845186236, 557110868066839, 11992827527938683, 258167485773838760, 5557525992329036272, 119635883127807659650, 2575380583292401972989 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A250982

LINKS

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

FORMULA

Empirical: a(n) = 27*a(n-1) -143*a(n-2) +623*a(n-3) -1885*a(n-4) +3219*a(n-5) -3457*a(n-6) +1819*a(n-7) +676*a(n-8) -2357*a(n-9) +2321*a(n-10) -1157*a(n-11) +271*a(n-12) -13*a(n-13) -4*a(n-14)

EXAMPLE

Some solutions for n=2

..1..0..2....2..2..2....1..0..1....1..0..2....2..0..2....1..1..1....1..1..0

..2..2..2....0..1..0....0..2..2....0..1..2....0..2..2....1..0..0....1..1..1

..0..1..1....0..2..1....1..1..1....1..0..1....2..2..0....2..2..2....2..2..2

CROSSREFS

Sequence in context: A252345 A121508 A252344 * A209907 A232679 A135437

Adjacent sequences:  A250973 A250974 A250975 * A250977 A250978 A250979

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

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Last modified September 23 11:53 EDT 2020. Contains 337310 sequences. (Running on oeis4.)