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A026966 as a simple table

n a(n)
0 1
1 2
2 6
3 34
4 116
5 438
6 1606
7 6002
8 22548
9 85342
10 324716
11 1241166
12 4762000
13 18329054
14 70742790
15 273689362
16 1061055812
17 4121135838
18 16032654628
19 62463904958
20 243682621224
21 951781620022
22 3721520393036
23 14565753339054
24 57060974849656
25 223721451300518
26 877830004120296

[1,2,6,34,116,438,1606,6002,22548,85342,324716,
 1241166,4762000,18329054,70742790,273689362,
 1061055812,4121135838,16032654628,62463904958,
 243682621224,951781620022,3721520393036,
 14565753339054,57060974849656,223721451300518,
 877830004120296]

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Last modified May 20 01:04 EDT 2022. Contains 353847 sequences. (Running on oeis4.)