Main diagonal of A291678.

Terms

a(0) =1a(1) =1a(2) =1a(3) =-2a(4) =-11a(5) =-24a(6) =-8a(7) =141a(8) =573a(9) =1087a(10) =-174a(11) =-8700a(12) =-31328a(13) =-52740a(14) =36387a(15) =534198a(16) =1742445a(17) =2540583a(18) =-3626189a(19) =-33115232a(20) =-97968686a(21) =-118497822a(22) =301668764a(23) =2060526393a(24) =5526622320a(25) =5165256226a(26) =-23033840842a(27) =-127995025736a(28) =-310560935969a(29) =-193716799472