Number of permutations of 0..floor((n*7-1)/2) on even squares of an n X 7 array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.
A215785
Number of permutations of 0..floor((n*7-1)/2) on even squares of an n X 7 array such that each row, column, diagonal and (downwards) antidiagonal of even squares is increasing.
Terms
- a(0) =1a(1) =5a(2) =42a(3) =262a(4) =2465a(5) =15485a(6) =146205a(7) =918637a(8) =8674386a(9) =54503318a(10) =514658321a(11) =3233726365a(12) =30535100957a(13) =191859642509
External references
- oeis: A215785