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A000773 as a simple table

na(n)
10
20
30
41
51
66
78
829
945
10130
11220
12561
131001
142366
154368
169829
1718565
1840410
1977540
20164921
21320001
22669526
231309528
242707629
255326685
2610919090
2721572460
2843942081
2987087001
30176565486
31350739488
32708653429
331410132405
342841788170
355662052980

[0,0,0,1,1,6,8,29,45,130,220,561,1001,2366,4368,
 9829,18565,40410,77540,164921,320001,669526,
 1309528,2707629,5326685,10919090,21572460,
 43942081,87087001,176565486,350739488,708653429,
 1410132405,2841788170,5662052980]