Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

A252049

Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum not 1 3 6 or 8 and every diagonal and antidiagonal sum 1 3 6 or 8.

Terms

    a(0) =3494a(1) =3030a(2) =4390a(3) =6562a(4) =16536a(5) =29180a(6) =45444a(7) =113456a(8) =205932a(9) =339128a(10) =861746a(11) =1594530a(12) =2738540a(13) =6782898a(14) =13250354a(15) =23666832a(16) =57515860a(17) =113323640a(18) =216311042a(19) =510417296a(20) =1031791182a(21) =1997922262a(22) =4755406774a(23) =9626094216a(24) =19356957970

External references