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A250804 Number of (7+1)X(n+1) 0..1 arrays with nondecreasing min(x(i,j),x(i,j-1)) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction 1
1970, 9956, 37986, 124366, 361344, 968942, 2437366, 5849556, 13519146, 30351918, 66573728, 143373294, 304256334, 638165212, 1326004914, 2734630046, 5605754032, 11435981086, 23239612118, 47079690548, 95137712202, 191866743358 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A250797

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -4*a(n-2) -17*a(n-3) +29*a(n-4) +16*a(n-5) -56*a(n-6) +6*a(n-7) +49*a(n-8) -19*a(n-9) -20*a(n-10) +11*a(n-11) +3*a(n-12) -2*a(n-13)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A289561 A256738 A252012 * A205210 A183692 A206218

Adjacent sequences:  A250801 A250802 A250803 * A250805 A250806 A250807

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 27 2014

STATUS

approved

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Last modified January 22 21:47 EST 2022. Contains 350504 sequences. (Running on oeis4.)