Number of n X 2 0..1 arrays with every element equal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

A297860

Number of n X 2 0..1 arrays with every element equal to 2, 3 or 4 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =5a(4) =10a(5) =25a(6) =54a(7) =125a(8) =282a(9) =641a(10) =1454a(11) =3301a(12) =7490a(13) =17001a(14) =38582a(15) =87565a(16) =198730a(17) =451025a(18) =1023614a(19) =2323125a(20) =5272402a(21) =11965881a(22) =27156934a(23) =61633501a(24) =139879130a(25) =317460001a(26) =720485262a(27) =1635163525a(28) =3711054050a(29) =8422351625

External references