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A051720 as a simple table

n a(n)
0 1
1 1
2 2
3 2
4 -1
5 -4
6 -1
7 8
8 7
9 -44
10 -2663
11 368
12 1247
13 -244
14 -1511
15 43416
16 1623817
17 -276356
18 -10405289
19 -21376
20 21491081
21 32209348
22 -2523785339
23 -107638072
24 1827648887
25 842271812
26 -11254630547
27 -17380760743952
28 596303510772251

[1,1,2,2,-1,-4,-1,8,7,-44,-2663,368,1247,-244,
 -1511,43416,1623817,-276356,-10405289,-21376,
 21491081,32209348,-2523785339,-107638072,
 1827648887,842271812,-11254630547,-17380760743952,
 596303510772251]

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Last modified January 25 01:33 EST 2020. Contains 331229 sequences. (Running on oeis4.)