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A000154 as a simple table

na(n)
01
11
22
37
435
5228
61834
717382
8195866
92487832
1035499576
11562356672
129794156448
13186025364016
143826961710272
1584775065603888
162011929826983504

[1,1,2,7,35,228,1834,17382,195866,2487832,
 35499576,562356672,9794156448,186025364016,
 3826961710272,84775065603888,2011929826983504]