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

A303085

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

Terms

    a(0) =4a(1) =2a(2) =32a(3) =29a(4) =258a(5) =432a(6) =2525a(7) =6313a(8) =30188a(9) =97855a(10) =428478a(11) =1605301a(12) =6821375a(13) =27390903a(14) =115569231a(15) =478335810a(16) =2017576268a(17) =8457463080a(18) =35707225807a(19) =150472100292a(20) =635822248364

External references