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A247723 as a simple table

na(n)
1960
24344
319744
489836
5408644
61859736
78465936
838539276
9175434372
10798617096
113635558924
1216550179186
1375341145844
14342975158260
151561327118072
167107632671418
1732356074089200
18147294571289114
19670529272776912

[960,4344,19744,89836,408644,1859736,8465936,
 38539276,175434372,798617096,3635558924,
 16550179186,75341145844,342975158260,
 1561327118072,7107632671418,32356074089200,
 147294571289114,670529272776912]