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A223947 Number of nX6 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 1
7, 49, 241, 928, 3115, 9919, 31899, 106838, 372791, 1333858, 4817747, 17407255, 62752228, 225884852, 813221202, 2931336019, 10582353096, 38251831384, 138386374911, 500895790541, 1813490035610, 6566735544675, 23781203864410 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A223949

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) -14*a(n-2) +3*a(n-3) +17*a(n-4) -16*a(n-5) +13*a(n-6) -32*a(n-7) +4*a(n-8) -442*a(n-9) -12*a(n-10) +148*a(n-11) +2028*a(n-12) +340*a(n-13) +438*a(n-14) +2729*a(n-15) +671*a(n-16) +154*a(n-17) -4426*a(n-18) -1581*a(n-19) -772*a(n-20) +98*a(n-21) -8*a(n-22) +88*a(n-23) +16*a(n-24)

EXAMPLE

Some solutions for n=3

..1..1..1..1..1..1....0..0..0..1..1..1....0..0..1..1..1..1....0..0..0..0..0..1

..0..0..0..1..1..1....0..1..1..1..1..1....1..1..1..1..1..1....0..0..1..1..1..1

..0..0..0..0..0..1....0..0..0..1..1..1....1..1..1..1..1..1....0..0..0..0..0..1

CROSSREFS

Sequence in context: A223615 A188768 A188757 * A207083 A207177 A207089

Adjacent sequences:  A223944 A223945 A223946 * A223948 A223949 A223950

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 29 2013

STATUS

approved

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Last modified April 8 21:44 EDT 2020. Contains 333329 sequences. (Running on oeis4.)