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A151520 as a simple table

na(n)
11
24
36
421
547
6134
7323
8876
92224
105885
1115146
1239574
13102250
14265574
15686208
161775646
174583718
1811835037
1930515520
2078652647

[1,4,6,21,47,134,323,876,2224,5885,15146,39574,
 102250,265574,686208,1775646,4583718,11835037,
 30515520,78652647]