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A179405 as a simple table

n a(n)
0 1
1 1
2 2
3 9
4 56
5 360
6 2934
7 26054
8 269128
9 3010680
10 37616880
11 504880992
12 7387701672
13 115228447152
14 1929016301016
15 34194883090440
16 643667407174464
17 12757366498618176
18 266426229010029696
19 5830527979298793024
20 133665090871032478080
21 3197905600674249843840

[1,1,2,9,56,360,2934,26054,269128,3010680,
 37616880,504880992,7387701672,115228447152,
 1929016301016,34194883090440,643667407174464,
 12757366498618176,266426229010029696,
 5830527979298793024,133665090871032478080,
 3197905600674249843840]

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Last modified September 23 03:40 EDT 2020. Contains 337291 sequences. (Running on oeis4.)