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A156305 as a simple table

na(n)
01
11
25
318
487
5290
61553
75015
825436
994500
10431464
111519749
128024004
1326746757
14125190249
15498138920
162221127601
178020960187
1838836436844
19138444409552
20655009491676
212512996318026
2210775473291178
2340824090856703

[1,1,5,18,87,290,1553,5015,25436,94500,431464,
 1519749,8024004,26746757,125190249,498138920,
 2221127601,8020960187,38836436844,138444409552,
 655009491676,2512996318026,10775473291178,
 40824090856703]