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A026771 as a simple table

n a(n)
1 1
2 6
3 31
4 156
5 784
6 3962
7 20173
8 103522
9 535294
10 2787700
11 14613710
12 77072816
13 408737760
14 2178631156
15 11666175215
16 62734622764
17 338660977020
18 1834690352066
19 9971834477972
20 54361287536706
21 297170702049966
22 1628670524735842

[1,6,31,156,784,3962,20173,103522,535294,2787700,
 14613710,77072816,408737760,2178631156,
 11666175215,62734622764,338660977020,
 1834690352066,9971834477972,54361287536706,
 297170702049966,1628670524735842]

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Last modified March 19 23:02 EDT 2019. Contains 321343 sequences. (Running on oeis4.)