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A250921 Number of (n+1)X(2+1) 0..2 arrays with no 2X2 subblock having its minimum diagonal element less than its minimum antidiagonal element 1
344, 4148, 50722, 628146, 7811640, 97205912, 1209466635, 15047023115, 187194478151, 2328806913892, 28971725729101, 360425582996318, 4483910822941575, 55782546828291714, 693968418758619695 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A250927

LINKS

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

FORMULA

Empirical: a(n) = 27*a(n-1) -280*a(n-2) +1630*a(n-3) -6022*a(n-4) +14885*a(n-5) -25640*a(n-6) +31686*a(n-7) -28463*a(n-8) +18548*a(n-9) -8602*a(n-10) +2711*a(n-11) -526*a(n-12) +48*a(n-13)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A183674 A245994 A246630 * A262791 A186935 A115221

Adjacent sequences:  A250918 A250919 A250920 * A250922 A250923 A250924

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 28 2014

STATUS

approved

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Last modified June 20 09:12 EDT 2019. Contains 324234 sequences. (Running on oeis4.)