Number of n X 3 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301994

Number of n X 3 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =15a(4) =48a(5) =155a(6) =499a(7) =1602a(8) =5137a(9) =16467a(10) =52784a(11) =169199a(12) =542375a(13) =1738618a(14) =5573261a(15) =17865479a(16) =57269040a(17) =183579891a(18) =588478091a(19) =1886407378a(20) =6047009817a(21) =19384109803a(22) =62137109808a(23) =199184819687a(24) =638500768991

External references