Number of nX2 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero.

A297817

Number of nX2 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =4a(2) =17a(3) =49a(4) =166a(5) =573a(6) =1933a(7) =6538a(8) =22165a(9) =75089a(10) =254350a(11) =861661a(12) =2919029a(13) =9888610a(14) =33499125a(15) =113483321a(16) =384441606a(17) =1302353053a(18) =4411914717a(19) =14946017274a(20) =50631856149a(21) =171522942625a(22) =581059476926

External references