login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A254844
Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the medians of the diagonal and antidiagonal minus the two sums of the central row and column nondecreasing horizontally and vertically
1
794128, 1323795, 1795490, 3986282, 7695684, 15676281, 29838772, 55992976, 100413564, 176175692, 297995148, 493162840, 792361276, 1249168284, 1921781524, 2908426536, 4313307192, 6311925400, 9077791868, 12909434532, 18083815180
OFFSET
1,1
COMMENTS
Column 7 of A254845
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) -45*a(n-2) +120*a(n-3) -202*a(n-4) +172*a(n-5) +150*a(n-6) -840*a(n-7) +1619*a(n-8) -1846*a(n-9) +959*a(n-10) +960*a(n-11) -3000*a(n-12) +3952*a(n-13) -3352*a(n-14) +1920*a(n-15) -720*a(n-16) +160*a(n-17) -16*a(n-18) for n>53
EXAMPLE
Some solutions for n=1
..0..0..0..1..0..1..0..0..0....0..0..0..1..1..0..0..0..0
..1..0..1..0..0..0..0..0..0....1..1..1..0..0..1..0..0..0
..0..0..1..0..1..0..0..0..0....0..0..0..0..0..0..0..1..0
CROSSREFS
Sequence in context: A234244 A255762 A255755 * A259304 A151561 A022203
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 08 2015
STATUS
approved