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A047871 as a simple table

na(n)
01
12
24
37
417
554
6358
71859
813911
9175164
103480256
1197050825
121947896985
1360119287462

[1,2,4,7,17,54,358,1859,13911,175164,3480256,
 97050825,1947896985,60119287462]