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A001764 as a simple table

n a(n)
0 1
1 1
2 3
3 12
4 55
5 273
6 1428
7 7752
8 43263
9 246675
10 1430715
11 8414640
12 50067108
13 300830572
14 1822766520
15 11124755664
16 68328754959
17 422030545335
18 2619631042665
19 16332922290300
20 102240109897695
21 642312451217745
22 4048514844039120
23 25594403741131680
24 162250238001816900

[1,1,3,12,55,273,1428,7752,43263,246675,1430715,
 8414640,50067108,300830572,1822766520,11124755664,
 68328754959,422030545335,2619631042665,
 16332922290300,102240109897695,642312451217745,
 4048514844039120,25594403741131680,
 162250238001816900]

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Last modified November 20 18:55 EST 2018. Contains 317413 sequences. (Running on oeis4.)