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A025971 as a simple table

n a(n)
0 1
1 21
2 287
3 3249
4 33159
5 317457
6 2913079
7 25951233
8 226266887
9 1941258033
10 16450020951
11 138048250977
12 1149556141735
13 9512774280849
14 78317007130103
15 642041894674881
16 5244884610706503
17 42718957418411505
18 347070960515299735
19 2813803342053741345

[1,21,287,3249,33159,317457,2913079,25951233,
 226266887,1941258033,16450020951,138048250977,
 1149556141735,9512774280849,78317007130103,
 642041894674881,5244884610706503,
 42718957418411505,347070960515299735,
 2813803342053741345]

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Last modified May 2 19:04 EDT 2024. Contains 372203 sequences. (Running on oeis4.)