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A057332
as a simple table
n
a(n)
0
4
1
15
2
52
3
210
4
1007
5
5156
6
25571
7
133293
8
727082
9
3874464
10
21072166
11
117829671
12
654556778
[4,15,52,210,1007,5156,25571,133293,727082, 3874464,21072166,117829671,654556778]
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Last modified April 19 19:02 EDT 2024. Contains 371798 sequences. (Running on oeis4.)