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A274875 as a simple table

na(n)
01
10
21
33
435
5226
63632
736780
8770481
910677444
10277114769
114882093495
12151410615066
133238949008872
14116936529884088
152943848265346408
16121318690777898613
173513774792447267240
18162794429514873454259
195332375501915984656921
20274393112247007415104839

[1,0,1,3,35,226,3632,36780,770481,10677444,
 277114769,4882093495,151410615066,3238949008872,
 116936529884088,2943848265346408,
 121318690777898613,3513774792447267240,
 162794429514873454259,5332375501915984656921,
 274393112247007415104839]