147264domain: NAppears in sequencesNumber of ways to place 2 nonattacking nightriders on an n X n cylindrical board.at n=23A196810a(0)=1; a(1)=1; for n >= 2, a(n) = a(n-A000120(n)) + a(n-1-A023416(n)).at n=47A297216Expansion of Product_{1 <= i_1 <= i_2 <= i_3 <= i_4} 1/(1 - x^(i_1*i_2*i_3*i_4)).at n=37A321566