T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero.
A231957
T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with every element equal to some horizontal, vertical, diagonal or antidiagonal neighbor, with top left element zero.
Terms
- a(0) =4a(1) =18a(2) =18a(3) =64a(4) =142a(5) =64a(6) =236a(7) =1034a(8) =1034a(9) =236a(10) =888a(11) =7756a(12) =14842a(13) =7756a(14) =888a(15) =3336a(16) =58350a(17) =220472a(18) =220472a(19) =58350a(20) =3336a(21) =12512a(22) =438540a(23) =3292876a(24) =6517534a(25) =3292876a(26) =438540a(27) =12512a(28) =46928a(29) =3295580
External references
- oeis: A231957