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A057513 as a simple table

na(n)
01
11
22
34
49
521
656
7153
8451
91357
104212
1113308
1242898
13140276
14465324
151561955
165300285
1718156813
1862732842
19218405402
20765657940

[1,1,2,4,9,21,56,153,451,1357,4212,13308,42898,
 140276,465324,1561955,5300285,18156813,62732842,
 218405402,765657940]