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A108555 as a simple table

na(n)
01
12
25
312
435
5116
6411
71482
85333
919030
1067265
11235704
12819863
132834600
149752951
1533428054
16114228713
17389419114
181325155261
194503031332
2015285291851
2151842203804
22175719341971
23595316455842
242016131645245
256826076021310

[1,2,5,12,35,116,411,1482,5333,19030,67265,235704,
 819863,2834600,9752951,33428054,114228713,
 389419114,1325155261,4503031332,15285291851,
 51842203804,175719341971,595316455842,
 2016131645245,6826076021310]