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A171064 as a simple table

n a(n)
0 0
1 1
2 1
3 7
4 15
5 64
6 175
7 631
8 1905
9 6433
10 20224
11 66529
12 212625
13 692119
14 2226799
15 7217728
16 23284815
17 75343591
18 243328225
19 786800449
20 2542156800
21 8217744577
22 26556314401
23 85835882791
24 277405671375
25 896595420736
26 2897714688751

[0,1,1,7,15,64,175,631,1905,6433,20224,66529,
 212625,692119,2226799,7217728,23284815,75343591,
 243328225,786800449,2542156800,8217744577,
 26556314401,85835882791,277405671375,896595420736,
 2897714688751]

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Last modified September 26 10:51 EDT 2020. Contains 337350 sequences. (Running on oeis4.)