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A278172 as a simple table

na(n)
10
25
318
4126
5737
64551
727692
8169131
91032173
106300804
1138460963
12234775180
131433121527
148748112011
1553400529535
16325969389167
171989793771357
1812146168927085
1974143070289741
20452586729708259
212762695786609647

[0,5,18,126,737,4551,27692,169131,1032173,6300804,
 38460963,234775180,1433121527,8748112011,
 53400529535,325969389167,1989793771357,
 12146168927085,74143070289741,452586729708259,
 2762695786609647]