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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
OFFSET
1,1
COMMENTS
Column 2 of A250927
LINKS
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 A340173
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 28 2014
STATUS
approved