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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 June 9 07:31 EDT 2024. Contains 373229 sequences. (Running on oeis4.)