Number of nX2 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero.

A303677

Number of nX2 0..1 arrays with every element unequal to 0, 1 or 3 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =2a(1) =5a(2) =7a(3) =17a(4) =31a(5) =49a(6) =103a(7) =193a(8) =327a(9) =641a(10) =1207a(11) =2129a(12) =4039a(13) =7585a(14) =13687a(15) =25585a(16) =47847a(17) =87425a(18) =162391a(19) =302609a(20) =556615a(21) =1031329a(22) =1916983a(23) =3538225a(24) =6550311a(25) =12155585a(26) =22474519a(27) =41599313a(28) =77121031a(29) =142707937

External references