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A291730 as a simple table

n a(n)
0 2
1 6
2 18
3 56
4 168
5 510
6 1544
7 4680
8 14176
9 42952
10 130128
11 394252
12 1194456
13 3618840
14 10963960
15 33217424
16 100638528
17 304903688
18 923764032
19 2798719872
20 8479257216
21 25689531840
22 77831351040
23 235804967056
24 714416256800
25 2164460716896
26 6557647800096

[2,6,18,56,168,510,1544,4680,14176,42952,130128,
 394252,1194456,3618840,10963960,33217424,
 100638528,304903688,923764032,2798719872,
 8479257216,25689531840,77831351040,235804967056,
 714416256800,2164460716896,6557647800096]

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Last modified March 28 21:57 EDT 2024. Contains 371254 sequences. (Running on oeis4.)