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A248987 as a simple table

na(n)
12
253
32
4204
553
62
7585
8204
953
102
111326
12585
13204
1453
152
162817
171654
18585
19204
2053
212
225028
234137
242042
25585
26204
2753
282
298789
307964
316065
322494
33585
34204
3553
362
3713970
3814661
3912644
408873
413014
42585
43204
4453
452
4621601
4723778
4824583
4920128
5012937
513606

[2,53,2,204,53,2,585,204,53,2,1326,585,204,53,2,
 2817,1654,585,204,53,2,5028,4137,2042,585,204,53,
 2,8789,7964,6065,2494,585,204,53,2,13970,14661,
 12644,8873,3014,585,204,53,2,21601,23778,24583,
 20128,12937,3606]