Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.
A252147
Number of (n+2)X(7+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 0 3 5 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 0 3 5 6 or 7.
Terms
- a(0) =44707a(1) =11573a(2) =21375a(3) =17166a(4) =44234a(5) =34320a(6) =108750a(7) =78781a(8) =254289a(9) =178690a(10) =631331a(11) =408458a(12) =1557034a(13) =972865a(14) =3894549a(15) =2351136a(16) =9859334a(17) =5724828a(18) =25112827a(19) =14226925a(20) =64213200a(21) =35652840a(22) =165276046a(23) =89908958a(24) =426691518a(25) =229088911a(26) =1104127770
External references
- oeis: A252147