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A065980 as a simple table

na(n)
11
23
320
4186
52248
633340
7585744
811891236
9273854368
107053523236
11200894140120
126268924259884
13212691682554960
147795165961244532
15306908654169113416
1612918649608270463740
17578931362074039774144

[1,3,20,186,2248,33340,585744,11891236,273854368,
 7053523236,200894140120,6268924259884,
 212691682554960,7795165961244532,
 306908654169113416,12918649608270463740,
 578931362074039774144]