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A177113 as a simple table

n a(n)
0 1
1 2
2 0
3 -2
4 -12
5 -42
6 -144
7 -466
8 -1476
9 -4522
10 -13384
11 -37794
12 -99964
13 -237738
14 -455104
15 -366706
16 2555276
17 20416150
18 103683976
19 445363518
20 1736519252
21 6310980502
22 21595986320
23 69654711278
24 210206070236
25 581729708502

[1,2,0,-2,-12,-42,-144,-466,-1476,-4522,-13384,
 -37794,-99964,-237738,-455104,-366706,2555276,
 20416150,103683976,445363518,1736519252,
 6310980502,21595986320,69654711278,210206070236,
 581729708502]

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Last modified January 26 22:05 EST 2022. Contains 350601 sequences. (Running on oeis4.)