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A234871 as a simple table

na(n)
01
15
265
31110
421620
5455126
610085845
7231814440
85475346305
9132090011900
103240886705386
1180621405042750
122028732009726240
1351548408940061460
141320738410528418175
1534083616545621832176
16885134579074202142075
1723114512490211287029665

[1,5,65,1110,21620,455126,10085845,231814440,
 5475346305,132090011900,3240886705386,
 80621405042750,2028732009726240,51548408940061460,
 1320738410528418175,34083616545621832176,
 885134579074202142075,23114512490211287029665]