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A056841 as a simple table

na(n)
11
21
32
45
515
654
7212
8908
94011
1018260
1184320
12394462
131860872
148843896
1542275308
16203113670
17980101070
184747504560
1923074132601

[1,1,2,5,15,54,212,908,4011,18260,84320,394462,
 1860872,8843896,42275308,203113670,980101070,
 4747504560,23074132601]