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A272561 as a simple table

na(n)
01
15
236
3156
4740
53024
612656
753552
8216197
9866044
103487225
1113994416
1256043560
13224257009
14897119561
153589343753

[1,5,36,156,740,3024,12656,53552,216197,866044,
 3487225,13994416,56043560,224257009,897119561,
 3589343753]