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A110521 as a simple table

na(n)
01
11
25
330
4224
51871
616771
7157668
81533970
915314626
10156008660
111615147014
1216944659846
13179746651907
141924700759635
1520776060271760
16225838715259574
172469974866825150
1827160344857205806
19300101157823582668

[1,1,5,30,224,1871,16771,157668,1533970,15314626,
 156008660,1615147014,16944659846,179746651907,
 1924700759635,20776060271760,225838715259574,
 2469974866825150,27160344857205806,
 300101157823582668]