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A281124 as a simple table

n a(n)
1 0
2 2
3 28
4 208
5 1364
6 8354
7 48992
8 278966
9 1554744
10 8524848
11 46147848
12 247246206
13 1313446848
14 6927856426
15 36320588564
16 189426835088
17 983467437564
18 5085683787674
19 26206495324448
20 134618732560222
21 689572430485168

[0,2,28,208,1364,8354,48992,278966,1554744,
 8524848,46147848,247246206,1313446848,6927856426,
 36320588564,189426835088,983467437564,
 5085683787674,26206495324448,134618732560222,
 689572430485168]

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Last modified November 21 04:33 EST 2019. Contains 329350 sequences. (Running on oeis4.)