Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

A304467

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =21a(2) =41a(3) =117a(4) =316a(5) =810a(6) =2208a(7) =6012a(8) =15837a(9) =42579a(10) =115618a(11) =309144a(12) =829935a(13) =2246106a(14) =6045980a(15) =16264045a(16) =43945153a(17) =118607081a(18) =319754491a(19) =863718047a(20) =2333646132a(21) =6300949455a(22) =17025299379a(23) =46023642233a(24) =124382811126a(25) =336236258224

External references