Number of nX4 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301960

Number of nX4 0..1 arrays with every element equal to 0, 1 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =9a(2) =25a(3) =64a(4) =169a(5) =441a(6) =1156a(7) =3025a(8) =7921a(9) =20736a(10) =54289a(11) =142129a(12) =372100a(13) =974169a(14) =2550409a(15) =6677056a(16) =17480761a(17) =45765225a(18) =119814916a(19) =313679521a(20) =821223649a(21) =2149991424a(22) =5628750625a(23) =14736260449a(24) =38580030724a(25) =101003831721a(26) =264431464441

External references