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A278350 as a simple table

na(n)
10
20
31
41
51
64
71
89
918
1015
111
1296
131
1441
15370
16435
171
181432
19149
203565
215906
22287
231
2433696
2515025
26753
27106562
28129651
291
30544040
312973
32960597
331782178
345167
352413385
3610534320
37501497
381397033
3931758946
4060862155
4162157
42149373496
431

[0,0,1,1,1,4,1,9,18,15,1,96,1,41,370,435,1,1432,
 149,3565,5906,287,1,33696,15025,753,106562,129651,
 1,544040,2973,960597,1782178,5167,2413385,
 10534320,501497,1397033,31758946,60862155,62157,
 149373496,1]