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A001939 as a simple table

na(n)
01
15
220
365
4185
5481
61165
72665
85820
912220
1024802
1148880
1293865
13176125
14323685
15583798
161035060
171806600
183108085
195276305
208846884
2114663645
2224044285
2339029560
2462755345
25100004806
26158022900
27247710570
28385366265
29595212280
30913040649
311391449780

[1,5,20,65,185,481,1165,2665,5820,12220,24802,
 48880,93865,176125,323685,583798,1035060,1806600,
 3108085,5276305,8846884,14663645,24044285,
 39029560,62755345,100004806,158022900,247710570,
 385366265,595212280,913040649,1391449780]