Number of (n+1)X(5+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nonincreasing.
A263796
Number of (n+1)X(5+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nonincreasing.
Terms
- a(0) =4a(1) =4a(2) =14a(3) =17a(4) =61a(5) =130a(6) =494a(7) =1435a(8) =4917a(9) =13962a(10) =41366a(11) =107284a(12) =280438a(13) =666212a(14) =1574783a(15) =3468753a(16) =7560914a(17) =15618901a(18) =31856173a(19) =62297164a(20) =120205886a(21) =224230549a(22) =412782291a(23) =739028663a(24) =1306513751a(25) =2256420867a(26) =3851037496a(27) =6442700456
External references
- oeis: A263796