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A111724 as a simple table

n a(n)
1 0
2 2
3 1
4 11
5 21
6 117
7 428
8 2172
9 10727
10 59393
11 345335
12 2143825
13 14038324
14 96834090
15 700715993
16 5305041715
17 41910528809
18 344714251149
19 2945819805408
20 26107419715988
21 239556359980239
22 2272364911439153
23 22252173805170347
24 224666265799310801
25 2335958333831561032

[0,2,1,11,21,117,428,2172,10727,59393,345335,
 2143825,14038324,96834090,700715993,5305041715,
 41910528809,344714251149,2945819805408,
 26107419715988,239556359980239,2272364911439153,
 22252173805170347,224666265799310801,
 2335958333831561032]

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Last modified April 17 23:03 EDT 2021. Contains 343071 sequences. (Running on oeis4.)