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A063478 as a simple table

na(n)
11
21
35
410
526
685
7170
8500
91450
103172
117922
1231031
1354290
14143140
15483860
161105000
172550410
188923300
1917494900
2053353040
21150655700
22313727044
23821223650
243291697500
255862907302
2614736586180
2748413209000
28113026206800

[1,1,5,10,26,85,170,500,1450,3172,7922,31031,
 54290,143140,483860,1105000,2550410,8923300,
 17494900,53353040,150655700,313727044,821223650,
 3291697500,5862907302,14736586180,48413209000,
 113026206800]