Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6.
A251823
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 3 or 6 and every diagonal and antidiagonal sum 3 or 6.
Terms
- a(0) =3930a(1) =8674a(2) =28202a(3) =75498a(4) =284506a(5) =1095314a(6) =3073138a(7) =12215010a(8) =49634706a(9) =140568394a(10) =576611546a(11) =2387784026a(12) =6790697458a(13) =28130266234a(14) =117517748130a(15) =334241631914
External references
- oeis: A251823