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A015627 as a simple table

na(n)
20
30
40
51
65
715
834
969
10121
11205
12314
13479
14679
15961
161290
171745
182239
192919
203650
214599
225619
236949
248290
2510057
2611861
2714105
2816418
2919343
3022165
3125819
3229424
3333799
3438199
3543631
3648780
3755325
3861649
3969199
4076632
4185771
4294235
43104895

[0,0,0,1,5,15,34,69,121,205,314,479,679,961,1290,
 1745,2239,2919,3650,4599,5619,6949,8290,10057,
 11861,14105,16418,19343,22165,25819,29424,33799,
 38199,43631,48780,55325,61649,69199,76632,85771,
 94235,104895]