T(n,k) = Number of 2n X 2k 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor.
A198408
T(n,k) = Number of 2n X 2k 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly one horizontal and vertical neighbor.
Terms
- a(0) =2a(1) =17a(2) =17a(3) =377a(4) =6986a(5) =377a(6) =11473a(7) =5057327a(8) =5057327a(9) =11473a(10) =375273a(11) =3850206168a(12) =85013617830a(13) =3850206168a(14) =375273a(15) =12456897a(20) =12456897a(21) =414711897
External references
- oeis: A198408