a(n) = IntegerPart(PolyGamma(n,1)).

Terms

a(0) =1a(1) =-2a(2) =6a(3) =-24a(4) =122a(5) =-726a(6) =5060a(7) =-40400a(8) =363240a(9) =-3630593a(10) =39926622a(11) =-479060379a(12) =6227402193a(13) =-87180957830