Number of nX2 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A317735

Number of nX2 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =22a(7) =53a(8) =130a(9) =320a(10) =788a(11) =1942a(12) =4787a(13) =11801a(14) =29093a(15) =71724a(16) =176825a(17) =435937a(18) =1074742a(19) =2649628a(20) =6532293a(21) =16104470a(22) =39703357a(23) =97883170a(24) =241317504a(25) =594935144a(26) =1466730842a(27) =3616023335a(28) =8914808625a(29) =21978235609

External references