Number of (n+2)X(3+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.

A252402

Number of (n+2)X(3+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) =983a(1) =774a(2) =1515a(3) =3302a(4) =8346a(5) =20998a(6) =50675a(7) =133296a(8) =343447a(9) =848007a(10) =2263089a(11) =5902801a(12) =14734098a(13) =39629269a(14) =104070383a(15) =261353804a(16) =706017540a(17) =1860981190a(18) =4689050899a(19) =12697106938a(20) =33535406222a(21) =84648673583a(22) =229505457761a(23) =606816472873

External references