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A001781 as a simple table

na(n)
01
19
246
3174
4541
51461
63544
77896
816414
932206
1060172
11107788
12186142
13311278
14505912
15801592
161241383
171883167
182803658
194103242
205911763
218395387
2211764688
2316284112
2422282988
2530168268
2640439192

[1,9,46,174,541,1461,3544,7896,16414,32206,60172,
 107788,186142,311278,505912,801592,1241383,
 1883167,2803658,4103242,5911763,8395387,11764688,
 16284112,22282988,30168268,40439192]