T(n,k) is the number of n X k 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
A201539
T(n,k) is the number of n X k 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =0a(1) =3a(2) =3a(3) =3a(4) =9a(5) =3a(6) =6a(7) =25a(8) =25a(9) =6a(10) =9a(11) =69a(12) =111a(13) =69a(14) =9a(15) =13a(16) =175a(17) =633a(18) =633a(19) =175a(20) =13a(21) =18a(22) =410a(23) =3354a(24) =7799a(25) =3354a(26) =410a(27) =18a(28) =24a(29) =899
External references
- oeis: A201539