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A186021 as a simple table

n a(n)
0 1
1 2
2 4
3 10
4 30
5 104
6 406
7 1754
8 8280
9 42294
10 231950
11 1357140
12 8427194
13 55288874
14 381798644
15 2765917090
16 20960284294
17 165729739608
18 1364153612318
19 11665484410114
20 103448316470744
21 949739632313502
22 9013431476894646
23 88304011710168692
24 891917738589610578
25 9277180664459998706

[1,2,4,10,30,104,406,1754,8280,42294,231950,
 1357140,8427194,55288874,381798644,2765917090,
 20960284294,165729739608,1364153612318,
 11665484410114,103448316470744,949739632313502,
 9013431476894646,88304011710168692,
 891917738589610578,9277180664459998706]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)