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A172135 as a simple table

n a(n)
1 0
2 1
3 18
4 412
5 4436
6 26133
7 111066
8 376560
9 1080942
10 2732909
11 6253408
12 13204356
13 26100160
14 48819677
15 87137934
16 149398608
17 247349946
18 397168485
19 620696612
20 946921684
21 1413726108
22 2069939461
23 2977725410
24 4215337872

[0,1,18,412,4436,26133,111066,376560,1080942,
 2732909,6253408,13204356,26100160,48819677,
 87137934,149398608,247349946,397168485,620696612,
 946921684,1413726108,2069939461,2977725410,
 4215337872]

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Last modified September 26 21:46 EDT 2020. Contains 337377 sequences. (Running on oeis4.)