T(n,k) is the number of n X k 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
A198528
T(n,k) is the number of n X k 0..4 arrays with values 0..4 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =5a(4) =15a(5) =5a(6) =15a(7) =193a(8) =193a(9) =15a(10) =52a(11) =3660a(12) =16714a(13) =3660a(14) =52a(15) =202a(16) =81844a(17) =1877316a(18) =1877316a(19) =81844a(20) =202a(21) =855a(22) =1948672a(23) =222590953a(24) =1084539825a(25) =222590953a(26) =1948672a(27) =855a(28) =3845a(29) =47436498
External references
- oeis: A198528