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

A303631

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

Terms

    a(0) =0a(1) =1a(2) =0a(3) =1a(4) =0a(5) =3a(6) =2a(7) =9a(8) =12a(9) =33a(10) =56a(11) =129a(12) =244a(13) =523a(14) =1034a(15) =2153a(16) =4336a(17) =8921a(18) =18104a(19) =37065a(20) =75456a(21) =154171a(22) =314266a(23) =641569a(24) =1308492a(25) =2670345a(26) =5447424a(27) =11115417a(28) =22677188a(29) =46269875

External references