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A128723 as a simple table

n a(n)
0 1
1 0
2 2
3 6
4 22
5 84
6 334
7 1368
8 5734
9 24480
10 106086
11 465462
12 2063658
13 9231084
14 41610162
15 188820726
16 861891478
17 3954732384
18 18230522422
19 84390187986
20 392120098258
21 1828220666844
22 8550445900442
23 40103716079436

[1,0,2,6,22,84,334,1368,5734,24480,106086,465462,
 2063658,9231084,41610162,188820726,861891478,
 3954732384,18230522422,84390187986,392120098258,
 1828220666844,8550445900442,40103716079436]

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Last modified March 28 12:26 EDT 2024. Contains 371254 sequences. (Running on oeis4.)