T(n,k)=Number of (n+3)X(k+3) 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
A230757
T(n,k)=Number of (n+3)X(k+3) 0..2 arrays x(i,j) with each element diagonally or antidiagonally next to at least one element with value (x(i,j)+1) mod 3, and upper left element zero.
Terms
- a(0) =12a(1) =192a(2) =192a(3) =2700a(4) =5544a(5) =2700a(6) =31212a(7) =178608a(8) =178608a(9) =31212a(10) =363312a(11) =4838400a(12) =13305708a(13) =4838400a(14) =363312a(15) =4120752a(16) =129731328a(17) =820317888a(18) =820317888a(19) =129731328a(20) =4120752a(21) =46949808a(22) =3423037464a(23) =51048476748a(24) =116879941620a(25) =51048476748
External references
- oeis: A230757