Number of (n+2)X5 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
A185471
Number of (n+2)X5 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =13659a(1) =76309a(2) =308692a(3) =1043186a(4) =3097348a(5) =8297059a(6) =20411234a(7) =46732687a(8) =100636591a(9) =205574323a(10) =401123377a(11) =751921908a(12) =1360579387a(13) =2385984676a(14) =4068843506a(15) =6766785098a(16) =11002001311a(17) =17525142877a(18) =27400120766a(19) =42115574722a(20) =63730107482
External references
- oeis: A185471