Number of nX4 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303310

Number of nX4 0..1 arrays with every element equal to 0, 1, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =5a(2) =17a(3) =36a(4) =74a(5) =165a(6) =361a(7) =783a(8) =1710a(9) =3744a(10) =8176a(11) =17851a(12) =39009a(13) =85239a(14) =186206a(15) =406800a(16) =888794a(17) =1941803a(18) =4242301a(19) =9268393a(20) =20249240a(21) =44239542a(22) =96652372a(23) =211161719a(24) =461336399a(25) =1007905991a(26) =2202025876a(27) =4810883806a(28) =10510594448a(29) =22963055655

External references