Partial sums of A217854.

Terms

a(0) =-1a(1) =3a(2) =12a(3) =-52a(4) =-27a(5) =1269a(6) =1318a(7) =5414a(8) =4685a(9) =14685a(10) =14806a(11) =3000790a(12) =3000959a(13) =3039375a(14) =3090000a(15) =2041424a(16) =2041713a(17) =36053937a(18) =36054298a(19) =100054298a(20) =100248779a(21) =100483035a(22) =100483564a(23) =110175797740a(24) =110175782115a(25) =110176239091a(26) =110176770532a(27) =110658660836