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A015520 as a simple table

na(n)
00
11
22
315
452
5269
61110
75179
822568
9102105
10452458
112028071
129033180
1340375141
14180115262
15804357075
163589982032
1716027891889
1871545586130
19319397983039
201425797413508
216364972640445
2228413716829478

[0,1,2,15,52,269,1110,5179,22568,102105,452458,
 2028071,9033180,40375141,180115262,804357075,
 3589982032,16027891889,71545586130,319397983039,
 1425797413508,6364972640445,28413716829478]