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 one or two horizontal and vertical neighbors.
A198669
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 one or two horizontal and vertical neighbors.
Terms
- a(0) =0a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =2a(7) =13a(8) =13a(9) =2a(10) =3a(11) =65a(12) =132a(13) =65a(14) =3a(15) =6a(16) =401a(17) =2715a(18) =2715a(19) =401a(20) =6a(21) =11a(22) =2798a(23) =59281a(24) =199923a(25) =59281a(26) =2798a(27) =11a(28) =23a(29) =21243
External references
- oeis: A198669