Number of n X 2 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
A303882
Number of n X 2 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =4a(2) =8a(3) =24a(4) =82a(5) =272a(6) =908a(7) =3076a(8) =10444a(9) =35480a(10) =120648a(11) =410432a(12) =1396424a(13) =4751472a(14) =16168096a(15) =55017104a(16) =187214896a(17) =637067040a(18) =2167858112a(19) =7376953152a(20) =25102872672a(21) =85422038784a(22) =290680899264a(23) =989152113472
External references
- oeis: A303882