Number of (4+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.
A253498
Number of (4+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) =3639a(1) =4720a(2) =6931a(3) =10477a(4) =18526a(5) =37469a(6) =82676a(7) =194708a(8) =483572a(9) =1255700a(10) =3383156a(11) =9387668a(12) =26645492a(13) =76907540a(14) =224670836a(15) =661915028a(16) =1961556212a(17) =5836296980a(18) =17412153716a(19) =52042992788a(20) =155742047732a(21) =466452288020
External references
- oeis: A253498