Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A326160

Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =6a(2) =9a(3) =25a(4) =60a(5) =160a(6) =396a(7) =996a(8) =2480a(9) =6213a(10) =15537a(11) =38935a(12) =97574a(13) =244521a(14) =612350a(15) =1533665a(16) =3841552a(17) =9623474a(18) =24106566a(19) =60386058a(20) =151263372a(21) =378906980a(22) =949140173a(23) =2377551381a(24) =5955661956a(25) =14918670478a(26) =37370561312a(27) =93611479464a(28) =234492365157

External references