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A181477 as a simple table

na(n)
01
15
225
385
4275
5751
61955
74615
810460
922220
1045628
1189420
12170340
13313140
14562020
15980628
161676370
172800410
184596290
197399930
2011732006
2118297950
2228155910
2342716750
2464037980
2594823756
26138922300
27201325900
28288988100

[1,5,25,85,275,751,1955,4615,10460,22220,45628,
 89420,170340,313140,562020,980628,1676370,2800410,
 4596290,7399930,11732006,18297950,28155910,
 42716750,64037980,94823756,138922300,201325900,
 288988100]