Number of (n+1) X 8 0..2 arrays with all 2 X 2 subblock sums the same.

Terms

a(0) =13225a(1) =15555a(2) =19217a(3) =26655a(4) =39697a(5) =66591a(6) =118097a(7) =227319a(8) =453025a(9) =954495a(10) =2073857a(11) =4730055a(12) =11163217a(13) =27594351a(14) =70508657a(15) =187283319a(16) =510129025a(17) =1427563935a(18) =4057091297a(19) =11721369255a(20) =34143669937a(21) =100392943311a(22) =296377454417