Number of 3Xn 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A302151

Number of 3Xn 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =1a(2) =4a(3) =5a(4) =11a(5) =34a(6) =88a(7) =271a(8) =798a(9) =2368a(10) =7071a(11) =21110a(12) =63163a(13) =188980a(14) =565622a(15) =1693239a(16) =5069374a(17) =15178832a(18) =45451143a(19) =136102762a(20) =407567006a(21) =1220499079a(22) =3654940301a(23) =10945255479a(24) =32777313021a(25) =98157159720a(26) =293948595170a(27) =880280943171

External references