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

A304128

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

Terms

    a(0) =3a(1) =7a(2) =9a(3) =19a(4) =33a(5) =53a(6) =89a(7) =155a(8) =261a(9) =439a(10) =749a(11) =1271a(12) =2149a(13) =3647a(14) =6189a(15) =10487a(16) =17781a(17) =30159a(18) =51133a(19) =86695a(20) =147013a(21) =249279a(22) =422669a(23) =716695a(24) =1215253a(25) =2060591a(26) =3493981a(27) =5924487a(28) =10045669a(29) =17033631

External references