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A121447 as a simple table

n a(n)
1 3
2 21
3 127
4 747
5 4386
6 25897
7 154077
8 923910
9 5581485
10 33949836
11 207787668
12 1278900412
13 7911394686
14 49165322241
15 306809507561
16 1921849861260
17 12079999018605
18 76170034283805
19 481680300300255
20 3054157623774495

[3,21,127,747,4386,25897,154077,923910,5581485,
 33949836,207787668,1278900412,7911394686,
 49165322241,306809507561,1921849861260,
 12079999018605,76170034283805,481680300300255,
 3054157623774495]

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Last modified March 29 02:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)