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A189815 as a simple table

n a(n)
1 1
2 1
3 3
4 10
5 53
6 304
7 2303
8 18768
9 185033
10 1954176
11 23756667
12 308077056
13 4457821821
14 68513332224
15 1150764459063
16 20443736745984
17 391167511473681
18 7884821722497024
19 169370797497060339
20 3818539009013907456
21 91013260219635394629
22 2269047587255097753600
23 59435772666287730632559

[1,1,3,10,53,304,2303,18768,185033,1954176,
 23756667,308077056,4457821821,68513332224,
 1150764459063,20443736745984,391167511473681,
 7884821722497024,169370797497060339,
 3818539009013907456,91013260219635394629,
 2269047587255097753600,59435772666287730632559]

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Last modified March 30 03:01 EDT 2024. Contains 371289 sequences. (Running on oeis4.)