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A087110 as a simple table

na(n)
11
21
36
415
520
615
76
81
91
1048
11687
124850
1320385
1455908
15104959
16137886
17127050
1880640
1933642
208316
21924
221
23342
2421267
25527876
267020525
2758015362
28324610399
291297791264
303839203452
318595153000
3214760228672
3319560928464
3419987430694

[1,1,6,15,20,15,6,1,1,48,687,4850,20385,55908,
 104959,137886,127050,80640,33642,8316,924,1,342,
 21267,527876,7020525,58015362,324610399,
 1297791264,3839203452,8595153000,14760228672,
 19560928464,19987430694]