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A153994 as a simple table

na(n)
01
12
22
34
416
526
6114
7913
83227
925373
10441919
113146641
1249361868
131683721022
1423850420259
15734273471828
1649324500595954
171380740815171041

[1,2,2,4,16,26,114,913,3227,25373,441919,3146641,
 49361868,1683721022,23850420259,734273471828,
 49324500595954,1380740815171041]