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A045631 as a simple table

na(n)
01
11
22
36
420
570
6243
7889
83276
912276
1046435
11176869
12677022
132602197
1410033212
1538787495
16150286400
17583434322
182268848988
198836447021
2034461894010
21134564992002
22526025788992
232058359779051
248061905110548
2531602659997975

[1,1,2,6,20,70,243,889,3276,12276,46435,176869,
 677022,2602197,10033212,38787495,150286400,
 583434322,2268848988,8836447021,34461894010,
 134564992002,526025788992,2058359779051,
 8061905110548,31602659997975]