Number of 3 X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A303017

Number of 3 X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =4a(1) =25a(2) =68a(3) =187a(4) =579a(5) =1797a(6) =5571a(7) =17382a(8) =54589a(9) =171758a(10) =541502a(11) =1710237a(12) =5408966a(13) =17123725a(14) =54254138a(15) =172005475a(16) =545590319a(17) =1731242563a(18) =5495164970a(19) =17446421788a(20) =55400350112a(21) =175946894177a(22) =558856114250

External references