Number of 2 X n array permutations with each element moving zero or one space horizontally or diagonally.

A189450

Number of 2 X n array permutations with each element moving zero or one space horizontally or diagonally.

Terms

    a(0) =1a(1) =5a(2) =16a(3) =61a(4) =225a(5) =841a(6) =3136a(7) =11705a(8) =43681a(9) =163021a(10) =608400a(11) =2270581a(12) =8473921a(13) =31625105a(14) =118026496a(15) =440480881a(16) =1643897025a(17) =6135107221a(18) =22896531856a(19) =85451020205a(20) =318907548961

External references