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A186308 as a simple table

na(n)
30
40
50
60
71
83
911
1033
1195
12260
13696
141816
154659
1611795
1729520
1873267
19180485
20442157
211077856
222617726
236336551
2415299287
2536857178
2688635225
27212829307
28510416549
291222826994
302927083468
317001510693
3216737477645

[0,0,0,0,1,3,11,33,95,260,696,1816,4659,11795,
 29520,73267,180485,442157,1077856,2617726,6336551,
 15299287,36857178,88635225,212829307,510416549,
 1222826994,2927083468,7001510693,16737477645]