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A129995 as a simple table

na(n)
01
15
2165
34675
465325
5543456
63155425
714146210
852259625
9166192975
10469090061
111201490445
122839166005
136268589250
1413060542825
1525881747316
1649095506065
1789615392425
18158091087925
19270522770375
20450420100221
21731644012660
221162094343345
231808433948150

[1,5,165,4675,65325,543456,3155425,14146210,
 52259625,166192975,469090061,1201490445,
 2839166005,6268589250,13060542825,25881747316,
 49095506065,89615392425,158091087925,270522770375,
 450420100221,731644012660,1162094343345,
 1808433948150]