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A278682 as a simple table

na(n)
10
20
37
445
5225
6709
71974
84524
99614
1018382
1133425
1256895
1393447
14146715
15224280
16331814
17480844
18679724
19945099
201288737
211733725
222296065
233006762
243886960
254977210
266304794
277921589
289862099
2912191459
3014952567
3118225900
3222064010
3326564952
3431792280

[0,0,7,45,225,709,1974,4524,9614,18382,33425,
 56895,93447,146715,224280,331814,480844,679724,
 945099,1288737,1733725,2296065,3006762,3886960,
 4977210,6304794,7921589,9862099,12191459,14952567,
 18225900,22064010,26564952,31792280]