Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
A252163
Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum equal to 2 3 4 6 or 7 and every 3X3 diagonal and antidiagonal sum not equal to 2 3 4 6 or 7.
Terms
- a(0) =7570a(1) =2075a(2) =3925a(3) =9058a(4) =26129a(5) =67674a(6) =170398a(7) =513123a(8) =1339027a(9) =3379880a(10) =10307117a(11) =26956608a(12) =68147852a(13) =209426605a(14) =547887143a(15) =1386788304a(16) =4287133295a(17) =11210580840a(18) =28398463398a(19) =88206429815a(20) =230468768285a(21) =584130500480
External references
- oeis: A252163