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A026650 as a simple table

n a(n)
1 1
2 6
3 21
4 108
5 370
6 1908
7 6587
8 34248
9 119142
10 623700
11 2182818
12 11487528
13 40391988
14 213451560
15 753295635
16 3993910416
17 14136717574
18 75152083716
19 266650874678
20 1420670333640
21 5050926317724
22 26960309526744
23 96015725922014

[1,6,21,108,370,1908,6587,34248,119142,623700,
 2182818,11487528,40391988,213451560,753295635,
 3993910416,14136717574,75152083716,266650874678,
 1420670333640,5050926317724,26960309526744,
 96015725922014]

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Last modified October 18 04:28 EDT 2019. Contains 328145 sequences. (Running on oeis4.)