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A007788 as a simple table

na(n)
01
11
24
319
4136
51201
613024
7165619
82425216
940132801
10740882944
1115091932019
12336257744896
138134269015601
14212309523595264
155946914908771219
16177934946000306176
175663754614516217601

[1,1,4,19,136,1201,13024,165619,2425216,40132801,
 740882944,15091932019,336257744896,8134269015601,
 212309523595264,5946914908771219,
 177934946000306176,5663754614516217601]