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A106707 as a simple table

n a(n)
0 0
1 -1
2 -4
3 -15
4 -56
5 -209
6 -780
7 -2911
8 -10864
9 -40545
10 -151316
11 -564719
12 -2107560
13 -7865521
14 -29354524
15 -109552575
16 -408855776
17 -1525870529
18 -5694626340
19 -21252634831
20 -79315912984
21 -296011017105
22 -1104728155436
23 -4122901604639
24 -15386878263120
25 -57424611447841

[0,-1,-4,-15,-56,-209,-780,-2911,-10864,-40545,
 -151316,-564719,-2107560,-7865521,-29354524,
 -109552575,-408855776,-1525870529,-5694626340,
 -21252634831,-79315912984,-296011017105,
 -1104728155436,-4122901604639,-15386878263120,
 -57424611447841]

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Last modified May 7 14:09 EDT 2021. Contains 343650 sequences. (Running on oeis4.)