Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
A252634
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 0 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 0 3 4 6 or 7.
Terms
- a(0) =1013a(1) =1684a(2) =4226a(3) =10259a(4) =28978a(5) =80304a(6) =205127a(7) =598762a(8) =1716412a(9) =4519719a(10) =13417956a(11) =39097862a(12) =105011019a(13) =314153189a(14) =922196750a(15) =2510126192a(16) =7536314876a(17) =22192510619a(18) =60965404095a(19) =183344920544a(20) =540553448514
External references
- oeis: A252634