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A055551 as a simple table

n a(n)
1 0
2 0
3 1
4 12
5 36
6 114
7 375
8 1071
9 2939
10 7706
11 20417
12 53332
13 139597
14 364217
15 957111
16 2526795
17 6725234
18 18069359
19 48961462 

[0,0,1,12,36,114,375,1071,2939,7706,20417,53332,
 139597,364217,957111,2526795,6725234,18069359,
 48961462]

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Last modified July 11 11:59 EDT 2024. Contains 374232 sequences. (Running on oeis4.)