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A089404 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 10
5 26
6 74
7 222
8 698
9 2264
10 7536
11 25600
12 88406
13 309440
14 1095354
15 3914340
16 14102324
17 51165004
18 186774368
19 685495334
20 2527957006 

[1,1,2,4,10,26,74,222,698,2264,7536,25600,88406,
 309440,1095354,3914340,14102324,51165004,
 186774368,685495334,2527957006]

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Last modified April 25 01:35 EDT 2024. Contains 371964 sequences. (Running on oeis4.)