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A060100 as a simple table

na(n)
01
15
219
355
4140
5316
6660
71284
82370
94170
107062
1111550
1218348
1328380
1442900
1563492
1692235
17131703
18185185
19256685
20351208
21474760
22634712
23839800
241100580
251429428
261841100
272352732
282984520
293759720
304705464
315852760
327237461
338900265
3410887855

[1,5,19,55,140,316,660,1284,2370,4170,7062,11550,
 18348,28380,42900,63492,92235,131703,185185,
 256685,351208,474760,634712,839800,1100580,
 1429428,1841100,2352732,2984520,3759720,4705464,
 5852760,7237461,8900265,10887855]