Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.

A252155

Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.

Terms

    a(0) =8309a(1) =8769a(2) =17803a(3) =29825a(4) =57271a(5) =112547a(6) =223442a(7) =447713a(8) =891380a(9) =1776728a(10) =3561844a(11) =7105520a(12) =14181200a(13) =28426208a(14) =56753264a(15) =113330576a(16) =227147536a(17) =453675152a(18) =906181712a(19) =1816146128a(20) =3628012880a(21) =7247618768a(22) =14525051344a(23) =29018570960

External references