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A200913 as a simple table

n a(n)
1 31
2 311
3 2551
4 13711
5 53231
6 109751
7 425911
8 486671
9 975551
10 3180271
11 3407351
12 3893431
13 5955071
14 10485751
15 10984991
16 13719991
17 18261311
18 25442231
19 34294991
20 47640631
21 67406351
22 81935311
23 96244151
24 129671671
25 146090551
26 196519991

[31,311,2551,13711,53231,109751,425911,486671,
 975551,3180271,3407351,3893431,5955071,10485751,
 10984991,13719991,18261311,25442231,34294991,
 47640631,67406351,81935311,96244151,129671671,
 146090551,196519991]

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Last modified March 28 13:17 EDT 2024. Contains 371254 sequences. (Running on oeis4.)