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A208374 as a simple table

n a(n)
1 2
2 16
3 72
4 420
5 2176
6 10660
7 60984
8 340816
9 1846240
10 11076228
11 66303360
12 390426916
13 2456007216
14 15586002640
15 98058552648
16 645057461220
17 4299810563584
18 28563593727716
19 195777751059000
20 1361449965542992
21 9468978890210480

[2,16,72,420,2176,10660,60984,340816,1846240,
 11076228,66303360,390426916,2456007216,
 15586002640,98058552648,645057461220,
 4299810563584,28563593727716,195777751059000,
 1361449965542992,9468978890210480]

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Last modified August 15 15:55 EDT 2022. Contains 356148 sequences. (Running on oeis4.)