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A066822 as a simple table

na(n)
01
15
220
371
4238
5770
62436
77590
823397
971566
10217646
11659022
121988805
135986176
1417980968
1553922096
16161492571
17483149385
181444245936
194314214443
2012880107548
2138436170366
22114657076900
23341926185770
241019435748435
253038815305981
269056974493700

[1,5,20,71,238,770,2436,7590,23397,71566,217646,
 659022,1988805,5986176,17980968,53922096,
 161492571,483149385,1444245936,4314214443,
 12880107548,38436170366,114657076900,341926185770,
 1019435748435,3038815305981,9056974493700]