Number of (n+2)X(2+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 or 4.
A251676
Number of (n+2)X(2+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 2 or 4.
Terms
- a(0) =489a(1) =865a(2) =2089a(3) =5065a(4) =13031a(5) =36075a(6) =100307a(7) =282489a(8) =805963a(9) =2300981a(10) =6582921a(11) =18872307a(12) =54105547a(13) =155166259a(14) =445147549a(15) =1277038995a(16) =3663729245a(17) =10511626757a(18) =30158791311a(19) =86528621567a(20) =248262408987a(21) =712297721821
External references
- oeis: A251676