Number of (2+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 8 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 8.
A252617
Number of (2+2) X (n+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 3 5 6 or 8 and every 3 X 3 column and antidiagonal sum not equal to 0 3 5 6 or 8.
Terms
- a(0) =725a(1) =1379a(2) =2815a(3) =6019a(4) =13879a(5) =31514a(6) =71856a(7) =170404a(8) =401865a(9) =928144a(10) =2224005a(11) =5295937a(12) =12290495a(13) =29585255a(14) =70665020a(15) =164351400a(16) =396380374a(17) =947723031a(18) =2206641736a(19) =5326057859a(20) =12737364595a(21) =29676414147a(22) =71648092677a(23) =171334763922
External references
- oeis: A252617