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A005751 as a simple table

na(n)
11
21
32
45
515
649
7180
8701
92891
1012371
1154564
12246319
131133602
145300255
1525119554
16120441076
17583373822
182851023191
1914044428996
2069677569603
21347904448580
221747195558582
238820848574074
2444747514381341
25228004950808983
261166498678253839
275990376960443432

[1,1,2,5,15,49,180,701,2891,12371,54564,246319,
 1133602,5300255,25119554,120441076,583373822,
 2851023191,14044428996,69677569603,347904448580,
 1747195558582,8820848574074,44747514381341,
 228004950808983,1166498678253839,5990376960443432]