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A097947 as a simple table

n a(n)
0 -2
1 1
2 -6
3 16
4 -62
5 225
6 -842
7 3136
8 -11706
9 43681
10 -163022
11 608400
12 -2270582
13 8473921
14 -31625106
15 118026496
16 -440480882
17 1643897025
18 -6135107222
19 22896531856
20 -85451020206
21 318907548961
22 -1190179175642
23 4441809153600
24 -16577057438762
25 61866420601441
26 -230888624967006

[-2,1,-6,16,-62,225,-842,3136,-11706,43681,
 -163022,608400,-2270582,8473921,-31625106,
 118026496,-440480882,1643897025,-6135107222,
 22896531856,-85451020206,318907548961,
 -1190179175642,4441809153600,-16577057438762,
 61866420601441,-230888624967006]

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Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)