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A173113 as a simple table

na(n)
01
155
21650
335750
4625625
59384375
6125125000
71519375000
817092968750
9180425781250
101804257812500
1117222460937500
12157872558593750
131396564941406250
1411970556640625000
1599754638671875000

[1,55,1650,35750,625625,9384375,125125000,
 1519375000,17092968750,180425781250,1804257812500,
 17222460937500,157872558593750,1396564941406250,
 11970556640625000,99754638671875000]