Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5 or 7 king-move adjacent elements, with upper left element zero.

A304921

Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 5 or 7 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =5a(2) =15a(3) =31a(4) =73a(5) =191a(6) =466a(7) =1125a(8) =2762a(9) =6805a(10) =16682a(11) =40883a(12) =100333a(13) =246242a(14) =604110a(15) =1482121a(16) =3636605a(17) =8922832a(18) =21892633a(19) =53715047a(20) =131794387a(21) =323367960a(22) =793407563a(23) =1946686405a(24) =4776346628a(25) =11719135709a(26) =28753802800a(27) =70549676372a(28) =173099084553

External references