Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

A298391

Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =7a(2) =15a(3) =29a(4) =63a(5) =167a(6) =473a(7) =1205a(8) =3161a(9) =8399a(10) =22021a(11) =58279a(12) =153851a(13) =405489a(14) =1070981a(15) =2826361a(16) =7458763a(17) =19688757a(18) =51962947a(19) =137149575a(20) =361994337a(21) =955427345a(22) =2521739769a(23) =6655820967a(24) =17567183369a(25) =46366440203a(26) =122378424487a(27) =323002621161

External references