Numerator of Bernoulli(n, -2/5).

Terms

a(0) =1a(1) =-9a(2) =109a(3) =-63a(4) =1051a(5) =-357a(6) =27973a(7) =-3423a(8) =93571a(9) =42903a(10) =-37758991a(11) =-3856083a(12) =27354236881a(13) =375324963a(14) =-34558569101a(15) =-49956225543