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A001392 as a simple table

n a(n)
4 1
5 9
6 54
7 273
8 1260
9 5508
10 23256
11 95931
12 389367
13 1562275
14 6216210
15 24582285
16 96768360
17 379629720
18 1485507600
19 5801732460
20 22626756594
21 88152205554
22 343176898988
23 1335293573130
24 5193831553416
25 20198233818840
26 78542105700240
27 305417807763705

[1,9,54,273,1260,5508,23256,95931,389367,1562275,
 6216210,24582285,96768360,379629720,1485507600,
 5801732460,22626756594,88152205554,343176898988,
 1335293573130,5193831553416,20198233818840,
 78542105700240,305417807763705]

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Last modified October 17 07:05 EDT 2018. Contains 316276 sequences. (Running on oeis4.)