Number of subsets of {2,...,n} such that the product of their elements is congruent to 0 (mod n+1).

Terms

a(0) =0a(1) =0a(2) =0a(3) =6a(4) =0a(5) =24a(6) =32a(7) =120a(8) =0a(9) =792a(10) =0a(11) =2016a(12) =5760a(13) =13056a(14) =0a(15) =55136a(16) =0a(17) =226944a(18) =387072a(19) =523776a(20) =0a(21) =4112000a(22) =5767168a(23) =8386560a(24) =30408704a(25) =58669056a(26) =0a(27) =259541376a(28) =0a(29) =1062731776