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A007581 as a simple table

na(n)
01
12
25
315
451
5187
6715
72795
811051
943947
10175275
11700075
122798251
1311188907
1444747435
15178973355
16715860651
172863377067
1811453377195
1945813246635
20183252462251
21733008800427
222932033104555
2311728128223915
2446912504507051
25187650001250987

[1,2,5,15,51,187,715,2795,11051,43947,175275,
 700075,2798251,11188907,44747435,178973355,
 715860651,2863377067,11453377195,45813246635,
 183252462251,733008800427,2932033104555,
 11728128223915,46912504507051,187650001250987]