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A028380 as a simple table

n a(n)
0 0
1 28
2 148
3 621
4 2420
5 9152
6 34164
7 126854
8 470288
9 1744200
10 6478088
11 24107105
12 89908380

[0,28,148,621,2420,9152,34164,126854,470288,
 1744200,6478088,24107105,89908380]

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Last modified August 3 14:34 EDT 2021. Contains 346438 sequences. (Running on oeis4.)