Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.
A252316
Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 1 3 6 or 7.
Terms
- a(0) =4197a(1) =1918a(2) =2493a(3) =6011a(4) =18820a(5) =62915a(6) =214325a(7) =735703a(8) =2536027a(9) =8732521a(10) =30044845a(11) =103433765a(12) =356211933a(13) =1226556113a(14) =4222869979a(15) =14539252073a(16) =50061142569a(17) =172368826263a(18) =593481176363
External references
- oeis: A252316