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A259000 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2444, 6271, 21073, 59549, 130296, 263417, 459014, 746902, 1157855, 1747626, 2526699, 3525095, 4828668, 6585115, 8782352, 11515630, 14947529, 19367769, 24856946, 31586776, 39913937, 50417363, 63364419, 79232160, 98809224 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A259006
LINKS
FORMULA
Empirical: a(n) = -3*a(n-1) -4*a(n-2) +a(n-3) +16*a(n-4) +33*a(n-5) +32*a(n-6) -11*a(n-7) -91*a(n-8) -156*a(n-9) -127*a(n-10) +41*a(n-11) +286*a(n-12) +443*a(n-13) +334*a(n-14) -73*a(n-15) -585*a(n-16) -860*a(n-17) -634*a(n-18) +54*a(n-19) +833*a(n-20) +1203*a(n-21) +888*a(n-22) +37*a(n-23) -845*a(n-24) -1230*a(n-25) -915*a(n-26) -135*a(n-27) +611*a(n-28) +912*a(n-29) +679*a(n-30) +153*a(n-31) -310*a(n-32) -477*a(n-33) -348*a(n-34) -93*a(n-35) +107*a(n-36) +166*a(n-37) +114*a(n-38) +30*a(n-39) -24*a(n-40) -34*a(n-41) -20*a(n-42) -4*a(n-43) +3*a(n-44) +3*a(n-45) +a(n-46) for n>60
EXAMPLE
Some solutions for n=4
..1..0..0..1....0..1..0..1....1..0..0..0....0..1..0..1....0..1..0..0
..0..0..0..0....0..0..0..1....0..0..1..0....0..0..0..0....0..1..0..1
..1..0..0..1....0..1..1..1....1..0..0..1....1..0..1..0....0..1..0..0
..1..1..1..1....1..1..1..0....1..1..1..1....1..0..1..0....0..1..1..1
..0..1..1..0....1..1..1..0....0..1..1..0....0..1..1..1....1..1..1..1
..1..1..0..0....1..1..0..1....1..1..0..1....0..0..0..1....1..1..1..1
CROSSREFS
Sequence in context: A233678 A252554 A259007 * A256898 A255077 A183629
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 16 2015
STATUS
approved

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Last modified May 22 18:14 EDT 2024. Contains 372758 sequences. (Running on oeis4.)