a(n) is the denominator of Sum_{primes p < n} 1/(n-p).

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =6a(5) =12a(6) =20a(7) =10a(8) =84a(9) =840a(10) =72a(11) =630a(12) =1320a(13) =2772a(14) =1560a(15) =90090a(16) =42a(17) =240240a(18) =1904a(19) =46410a(20) =95760a(21) =639540a(22) =5040a(23) =9699690a(24) =637560a(25) =14316120a(26) =92400a(27) =176125950a(28) =308880a(29) =20078358300