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

A318541

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

Terms

    a(0) =5a(1) =5a(2) =13a(3) =31a(4) =78a(5) =207a(6) =516a(7) =1288a(8) =3270a(9) =8271a(10) =20866a(11) =52679a(12) =133064a(13) =336062a(14) =848616a(15) =2143101a(16) =5412264a(17) =13667874a(18) =34516655a(19) =87168177a(20) =220132818a(21) =555919912a(22) =1403912579a(23) =3545419471a(24) =8953548234a(25) =22611157039a(26) =57101877461a(27) =144204222586

External references