Denominator of (1/n)*Sum_{k=0..n-1} 1/binomial(n-1,k) for n>0 else 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =6a(4) =3a(5) =15a(6) =30a(7) =420a(8) =105a(9) =315a(10) =315a(11) =6930a(12) =3465a(13) =90090a(14) =180180a(15) =72072a(16) =9009a(17) =153153a(18) =153153a(19) =5819814a(20) =14549535a(21) =14549535a(22) =29099070a(23) =1338557220a(24) =334639305a(25) =1673196525a(26) =1673196525a(27) =10039179150a(28) =10039179150a(29) =582272390700