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A253523 Number of (n+1)X(7+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically 1
876277, 2544290, 2419612, 2475610, 3429207, 5591131, 10168992, 21354009, 51569897, 137921376, 391536224, 1145589321, 3399373692, 10150512690, 30391595567, 91100083209, 273208024363, 819511203340, 2458396582146 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A253524
LINKS
FORMULA
Empirical: a(n) = 9*a(n-1) -33*a(n-2) +65*a(n-3) -75*a(n-4) +51*a(n-5) -19*a(n-6) +3*a(n-7) for n>15
EXAMPLE
Some solutions for n=1
..0..0..0..0..0..0..0..0....0..0..0..1..2..0..2..2....0..0..0..0..0..0..0..0
..0..1..2..2..1..1..2..0....2..1..0..0..0..0..2..2....2..2..2..0..2..2..0..2
CROSSREFS
Sequence in context: A223886 A204509 A271263 * A254421 A254428 A271264
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2015
STATUS
approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)