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A250909
Number of (n+1)X(4+1) 0..2 arrays with no 2X2 subblock having its maximum diagonal element less than its minimum antidiagonal element
1
39960, 6621219, 1096982379, 181725094746, 30104106257115, 4986961280614953, 826125782084148708, 136853637633971644347, 22670782687226177355267, 3755577099313037361116844, 622138174177304855831638383
OFFSET
1,1
COMMENTS
Column 4 of A250913
LINKS
FORMULA
Empirical: a(n) = 202*a(n-1) -6346*a(n-2) +54499*a(n-3) -108047*a(n-4) +2308813*a(n-5) -8304217*a(n-6) -16011215*a(n-7) +3358369*a(n-8) +18927043*a(n-9) -60255820*a(n-10) +18024160*a(n-11) +47390528*a(n-12) -6773760*a(n-13)
EXAMPLE
Some solutions for n=1
..1..1..2..2..0....1..2..2..1..2....2..0..2..2..2....2..1..2..0..0
..1..0..0..0..1....1..2..1..1..2....1..0..1..1..2....2..1..0..0..2
CROSSREFS
Sequence in context: A076670 A251757 A250334 * A252332 A106772 A015328
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 28 2014
STATUS
approved