Number of (7+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253501
Number of (7+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
Terms
- a(0) =48293a(1) =55362a(2) =68992a(3) =89339a(4) =133284a(5) =224747a(6) =415106a(7) =817442a(8) =1686914a(9) =3620258a(10) =8070146a(11) =18719522a(12) =45267074a(13) =114108578a(14) =299030786a(15) =810592802a(16) =2258869634a(17) =6430881698a(18) =18601281026a(19) =54421205282a(20) =160498430594a(21) =475965011618
External references
- oeis: A253501