Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.

A252409

Number of (2+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.

Terms

    a(0) =293a(1) =442a(2) =774a(3) =1157a(4) =2489a(5) =5060a(6) =8307a(7) =19629a(8) =41216a(9) =69493a(10) =168252a(11) =355926a(12) =607953a(13) =1485818a(14) =3150880a(15) =5435149a(16) =13364581a(17) =28381270a(18) =49366029a(19) =121983257a(20) =259326130a(21) =454266335a(22) =1127069084a(23) =2398177242a(24) =4225704669a(25) =10519451346a(26) =22399493726

External references