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A223995 Number of nX4 0..2 arrays with antidiagonals unimodal and rows and diagonals nondecreasing 1
15, 155, 1144, 7927, 55333, 388598, 2743444, 19437479, 138010718, 981047716, 6977843175, 49645292212, 353262192994, 2513898151334, 17890175634324, 127318180862693, 906089796193803, 6448444001034017, 45892351529878911 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A223999

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) -69*a(n-2) +66*a(n-3) +226*a(n-4) -172*a(n-5) -1192*a(n-6) +2157*a(n-7) -1714*a(n-8) -2876*a(n-9) +4966*a(n-10) +12095*a(n-11) -17584*a(n-12) +28968*a(n-13) +156*a(n-14) -2874*a(n-15) -2964*a(n-16) +15876*a(n-17) +1008*a(n-18) for n>19

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A278803 A157380 A098685 * A323971 A006096 A099915

Adjacent sequences:  A223992 A223993 A223994 * A223996 A223997 A223998

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 30 2013

STATUS

approved

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Last modified February 16 21:59 EST 2019. Contains 320200 sequences. (Running on oeis4.)