Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 5 6 or 7.
A252213
Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 2 5 6 or 7.
Terms
- a(0) =1212a(1) =1078a(2) =1437a(3) =2836a(4) =6674a(5) =17478a(6) =47580a(7) =130032a(8) =357094a(9) =983466a(10) =2708592a(11) =7459998a(12) =20551442a(13) =56618848a(14) =155979808a(15) =429716464a(16) =1183857470a(17) =3261485984a(18) =8985277196a(19) =24754145982a(20) =68196861104a(21) =187880081284a(22) =517603412018
External references
- oeis: A252213