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A181888 as a simple table

na(n)
10
20
39
464
5259
6784
71974
84368
98778
1016368
1128743
1248048
1377077
14119392
15179452
16262752
17375972
18527136
19725781
20983136
211312311
221728496
232249170
242894320
253686670
264651920
275818995
287220304
298892009
3010874304
3113211704
3215953344
3319153288
3422870848
3527170913
3632124288
3737808043
3844305872
3951708462
4060113872

[0,0,9,64,259,784,1974,4368,8778,16368,28743,
 48048,77077,119392,179452,262752,375972,527136,
 725781,983136,1312311,1728496,2249170,2894320,
 3686670,4651920,5818995,7220304,8892009,10874304,
 13211704,15953344,19153288,22870848,27170913,
 32124288,37808043,44305872,51708462,60113872]