|
|
A256953
|
|
Number of (n+2)X(7+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the central row and central column minus the two minimums of the diagonal and antidiagonal nondecreasing horizontally and vertically
|
|
1
|
|
|
1640073, 6268245, 12037534, 18040804, 26587024, 38735508, 56306098, 77953860, 108710066, 143899574, 191489068, 248887210, 328813654, 421350126, 546389574, 698911558, 922595390, 1188517170, 1572350918, 2050531494, 2786854414
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
FORMULA
|
Empirical: a(n) = 2*a(n-1) -2*a(n-3) +7*a(n-4) -11*a(n-5) -2*a(n-6) +12*a(n-7) -12*a(n-8) +9*a(n-9) +12*a(n-10) -16*a(n-11) -4*a(n-12) +14*a(n-13) -16*a(n-14) +16*a(n-16) -8*a(n-17) for n>37
|
|
EXAMPLE
|
Some solutions for n=1
..0..0..1..0..0..1..1..1..1....0..0..0..0..0..0..0..0..0
..0..0..0..1..0..1..0..1..1....0..0..0..0..1..0..1..1..1
..1..0..0..0..0..0..0..0..1....1..1..1..0..1..1..0..1..0
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|