Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,1,2,0,3 for x=0,1,2,3,4.

A196961

Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,1,2,0,3 for x=0,1,2,3,4.

Terms

    a(0) =2a(1) =6a(2) =15a(3) =48a(4) =145a(5) =449a(6) =1397a(7) =4342a(8) =13500a(9) =41981a(10) =130562a(11) =406025a(12) =1262695a(13) =3926857a(14) =12212128a(15) =37978464a(16) =118109177a(17) =367307576a(18) =1142289291a(19) =3552403843a(20) =11047615721a(21) =34356964532a(22) =106846675430a(23) =332282325069

External references