Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302630

Number of nX3 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =9a(2) =8a(3) =19a(4) =42a(5) =82a(6) =189a(7) =469a(8) =1029a(9) =2372a(10) =5661a(11) =12788a(12) =29440a(13) =69193a(14) =158299a(15) =364581a(16) =849888a(17) =1955567a(18) =4508226a(19) =10463966a(20) =24138613a(21) =55695301a(22) =128985441a(23) =297870624a(24) =687700145a(25) =1590857932a(26) =3675434388a(27) =8488858425a(28) =19626303139a(29) =45350971169

External references