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A298884 as a simple table

n a(n)
1 0
2 3
3 15
4 40
5 123
6 516
7 1818
8 7768
9 41048
10 242083
11 1483959
12 10171555

[0,3,15,40,123,516,1818,7768,41048,242083,1483959,
 10171555]

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Last modified January 17 06:12 EST 2022. Contains 350378 sequences. (Running on oeis4.)