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A064819 as a simple table

na(n)
1-7
2-19
3-19
489
52141
629741
7510149
89699161
9223092029
106469692269
11200560488761
127420738133129
13304250263525361
1413082761331667821
15614889782588488601
1632589158477190041249
171922760350154212635349
18117288381359406970978781

[-7,-19,-19,89,2141,29741,510149,9699161,
 223092029,6469692269,200560488761,7420738133129,
 304250263525361,13082761331667821,
 614889782588488601,32589158477190041249,
 1922760350154212635349,117288381359406970978781]