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A187928 as a simple table

n a(n)
10 1
11 1
12 4
13 15
14 42
15 135
16 440
17 1480
18 5106
19 17890
20 63264
21 226018
22 812354
23 2936837
24 10666188
25 38901190
26 142386358 

[1,1,4,15,42,135,440,1480,5106,17890,63264,226018,
 812354,2936837,10666188,38901190,142386358]

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Last modified April 24 14:54 EDT 2024. Contains 371960 sequences. (Running on oeis4.)