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A120414
as a simple table
n
a(n)
0
0
1
1
2
2
3
6
4
18
5
45
6
102
7
213
8
426
9
821
10
1538
11
2820
12
5075
13
8996
14
15743
15
27247
16
46709
17
79405
18
133996
19
224640
20
374400
[0,1,2,6,18,45,102,213,426,821,1538,2820,5075, 8996,15743,27247,46709,79405,133996,224640,374400]
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Last modified April 19 02:01 EDT 2024. Contains 371782 sequences. (Running on oeis4.)