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A247639 as a simple table

na(n)
01
15
231
3210
41488
510826
680111
7599671
84525573
934357725
10262011295
112004962487
1215383479300

[1,5,31,210,1488,10826,80111,599671,4525573,
 34357725,262011295,2004962487,15383479300]