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A030878 as a simple table

na(n)
12
25
315
461
5308
61851
712959
8103678
9933103
109331039
11102641438
121231697258
1316012064360
14224168901043
153362533515646
1653800536250343
17914609116255840
1816462964092605136
19312796317759497601
206255926355189952031

[2,5,15,61,308,1851,12959,103678,933103,9331039,
 102641438,1231697258,16012064360,224168901043,
 3362533515646,53800536250343,914609116255840,
 16462964092605136,312796317759497601,
 6255926355189952031]