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A026980 as a simple table

na(n)
01
13
28
325
460
5147
6336
7882
81960
94631
1010104
1125207
1254292
13125895
14268576
15653191
161383228
173172981
186679960
1915996204
2033515856
2176350225
22159339600
23377580850
24785368168
251780545051
263692982328
278684805392
2817968562880

[1,3,8,25,60,147,336,882,1960,4631,10104,25207,
 54292,125895,268576,653191,1383228,3172981,
 6679960,15996204,33515856,76350225,159339600,
 377580850,785368168,1780545051,3692982328,
 8684805392,17968562880]