a(n) is the period of the periodic k-sequence q_k=lcm(k+1,k+2,...,k+n)/(n*binomial(k+n,n)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =12a(5) =20a(6) =60a(7) =105a(8) =280a(9) =504a(10) =2520a(11) =27720a(12) =27720a(13) =51480a(14) =72072a(15) =45045a(16) =720720a(17) =1361360a(18) =12252240a(19) =46558512a(20) =33256080a(21) =21162960a(22) =232792560a(23) =5354228880a(24) =1070845776a(25) =2059318800a(26) =2974571600a(27) =11473347600a(28) =80313433200