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A259869 as a simple table

n a(n)
0 -1
1 0
2 1
3 2
4 8
5 40
6 244
7 1736
8 14084
9 128176
10 1292788
11 14313272
12 172603124
13 2252192608
14 31620422980
15 475350915656
16 7618759828388
17 129697180826512
18 2337145267316500
19 44446207287450968
20 889595868295057364
21 18693361200724345024
22 411475140936880082020

[-1,0,1,2,8,40,244,1736,14084,128176,1292788,
 14313272,172603124,2252192608,31620422980,
 475350915656,7618759828388,129697180826512,
 2337145267316500,44446207287450968,
 889595868295057364,18693361200724345024,
 411475140936880082020]

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Last modified August 25 03:10 EDT 2019. Contains 326318 sequences. (Running on oeis4.)