Number of nX4 0..1 arrays with every element unequal to 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

A305512

Number of nX4 0..1 arrays with every element unequal to 1, 2, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =1a(2) =6a(3) =10a(4) =13a(5) =38a(6) =73a(7) =164a(8) =351a(9) =749a(10) =1719a(11) =3710a(12) =8182a(13) =18453a(14) =40666a(15) =90453a(16) =201921a(17) =448575a(18) =999776a(19) =2226884a(20) =4957665a(21) =11048840a(22) =24608791a(23) =54816139a(24) =122135777a(25) =272069268a(26) =606114434a(27) =1350348321a(28) =3008242832a(29) =6701882069

External references