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A113531 as a simple table

n a(n)
0 1
1 21
2 321
3 2005
4 7737
5 22461
6 54121
7 114381
8 219345
9 390277
10 654321
11 1045221
12 1604041
13 2379885
14 3430617
15 4823581
16 6636321
17 8957301
18 11886625
19 15536757
20 20033241
21 25515421
22 32137161
23 40067565
24 49491697
25 60611301
26 73645521

[1,21,321,2005,7737,22461,54121,114381,219345,
 390277,654321,1045221,1604041,2379885,3430617,
 4823581,6636321,8957301,11886625,15536757,
 20033241,25515421,32137161,40067565,49491697,
 60611301,73645521]

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Last modified April 25 07:07 EDT 2024. Contains 371964 sequences. (Running on oeis4.)