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A036384 as a simple table

na(n)
10
20
30
40
51
63
78
818
940
1087
11191
12400
13855
141776
153697
167644
1715752
1832365
1966304
20135570
21276590
22563432
231146045
242328063
254724270
269577176
2719397428
2839256129
2979390449
30160450210
31324088695
32654261484

[0,0,0,0,1,3,8,18,40,87,191,400,855,1776,3697,
 7644,15752,32365,66304,135570,276590,563432,
 1146045,2328063,4724270,9577176,19397428,39256129,
 79390449,160450210,324088695,654261484]