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A178381 as a simple table

na(n)
01
11
22
33
46
510
620
735
870
9125
10250
11450
12900
131625
143250
155875
1611750
1721250
1842500
1976875
20153750
21278125
22556250
231006250
242012500
253640625
267281250
2713171875
2826343750
2947656250
3095312500
31172421875
32344843750

[1,1,2,3,6,10,20,35,70,125,250,450,900,1625,3250,
 5875,11750,21250,42500,76875,153750,278125,556250,
 1006250,2012500,3640625,7281250,13171875,26343750,
 47656250,95312500,172421875,344843750]