Number of (n+2) X (7+2) 0..2 arrays with every 3 X 3 subblock row and column sum 2 3 or 4 and every diagonal and antidiagonal sum not 2 3 or 4.
A252227
Number of (n+2) X (7+2) 0..2 arrays with every 3 X 3 subblock row and column sum 2 3 or 4 and every diagonal and antidiagonal sum not 2 3 or 4.
Terms
- a(0) =9922a(1) =219824a(2) =718514a(3) =1619714a(4) =4297634a(5) =13842872a(6) =44099648a(7) =135348914a(8) =414030384a(9) =1274652450a(10) =3930132146a(11) =12105939362a(12) =37274285880a(13) =114781892768a(14) =353490924114
External references
- oeis: A252227