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A291620 as a simple table

na(n)
10
20
30
40
5131
60
7233
8167
92381
10647
110
12233
130
14941
15263
160
170
18353
190
200
21797
220
230
240
25941
260
270
288273
29569
300
310
32569
331181
340
350
3622133
37761
380
39761
401721
41839
421811
43881
440
451811
46929
471973
480
490
501049
511181
529323
532309
541187
550
562441
572441

[0,0,0,0,131,0,233,167,2381,647,0,233,0,941,263,0,
 0,353,0,0,797,0,0,0,941,0,0,8273,569,0,0,569,1181,
 0,0,22133,761,0,761,1721,839,1811,881,0,1811,929,
 1973,0,0,1049,1181,9323,2309,1187,0,2441,2441]