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A081251 as a simple table

n a(n)
1 2
2 6
3 20
4 60
5 182
6 546
7 1640
8 4920
9 14762
10 44286
11 132860
12 398580
13 1195742
14 3587226
15 10761680
16 32285040
17 96855122
18 290565366
19 871696100
20 2615088300
21 7845264902
22 23535794706
23 70607384120
24 211822152360
25 635466457082
26 1906399371246

[2,6,20,60,182,546,1640,4920,14762,44286,132860,
 398580,1195742,3587226,10761680,32285040,96855122,
 290565366,871696100,2615088300,7845264902,
 23535794706,70607384120,211822152360,635466457082,
 1906399371246]

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Last modified March 28 15:38 EDT 2024. Contains 371254 sequences. (Running on oeis4.)