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A272557 as a simple table

na(n)
01
14
236
3156
4740
53040
612852
752648
8214820
9865744
103487180
1113994100
1256047356
13224295004
14897465820
153590094664

[1,4,36,156,740,3040,12852,52648,214820,865744,
 3487180,13994100,56047356,224295004,897465820,
 3590094664]