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A131992 as a simple table

n a(n)
1 31
2 121
3 781
4 2801
5 16105
6 30941
7 88741
8 137561
9 292561
10 732541
11 954305
12 1926221
13 2896405
14 3500201
15 4985761
16 8042221
17 12326281
18 14076605
19 20456441
20 25774705
21 28792661
22 39449441
23 48037081
24 63455221
25 89451461
26 105101005
27 113654321

[31,121,781,2801,16105,30941,88741,137561,292561,
 732541,954305,1926221,2896405,3500201,4985761,
 8042221,12326281,14076605,20456441,25774705,
 28792661,39449441,48037081,63455221,89451461,
 105101005,113654321]

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Last modified April 24 03:03 EDT 2024. Contains 371917 sequences. (Running on oeis4.)