Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

A304664

Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =3a(1) =9a(2) =13a(3) =30a(4) =66a(5) =123a(6) =252a(7) =535a(8) =1074a(9) =2194a(10) =4530a(11) =9231a(12) =18873a(13) =38722a(14) =79180a(15) =161992a(16) =331766a(17) =678927a(18) =1389398a(19) =2844206a(20) =5821252a(21) =11914196a(22) =24386446a(23) =49913147a(24) =102159115a(25) =209097391a(26) =427973147a(27) =875956927a(28) =1792880557a(29) =3669604702

External references