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

A302281

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

Terms

    a(0) =0a(1) =23a(2) =79a(3) =89a(4) =283a(5) =649a(6) =1621a(7) =4209a(8) =9563a(9) =25179a(10) =64825a(11) =159647a(12) =400017a(13) =1006221a(14) =2575287a(15) =6472771a(16) =16199339a(17) =41000497a(18) =103869515a(19) =262156417a(20) =659973671a(21) =1666508525a(22) =4216930049a(23) =10647519701a(24) =26860910357a(25) =67834767395a(26) =171448094515

External references