a(n) = IntegerPart(PolyGamma(n, 2)).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =2a(5) =-6a(6) =20a(7) =-80a(8) =360a(9) =-1793a(10) =9822a(11) =-58779a(12) =381393a(13) =-2666630a(14) =19984218a(15) =-159791481a(16) =1357763223a(17) =-12217090921a(18) =116044807396