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A271260 as a simple table

na(n)
01
15
220
364
4188
5908
63768
715072
861616
9244688
10978644
113913036
1215637312
1362573512
14250302340
151001208180

[1,5,20,64,188,908,3768,15072,61616,244688,978644,
 3913036,15637312,62573512,250302340,1001208180]