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A218090 as a simple table

na(n)
01
11
21
31
42
53
68
717
863
9224
101248
118218
1275992
13906635
1414447433
15303100595
168415834690
17309390830222
1815105805368214
19982300491033887

[1,1,1,1,2,3,8,17,63,224,1248,8218,75992,906635,
 14447433,303100595,8415834690,309390830222,
 15105805368214,982300491033887]