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A159972 as a simple table

n a(n)
0 1
1 -1
2 0
3 2
4 -7
5 21
6 -63
7 195
8 -624
9 2054
10 -6916
11 23712
12 -82498
13 290510
14 -1033410
15 3707850
16 -13402695
17 48760365
18 -178405155
19 656043855
20 -2423307045
21 8987427465
22 -33453694485
23 124936258125
24 -467995871775
25 1757900019099
26 -6619846420551

[1,-1,0,2,-7,21,-63,195,-624,2054,-6916,23712,
 -82498,290510,-1033410,3707850,-13402695,48760365,
 -178405155,656043855,-2423307045,8987427465,
 -33453694485,124936258125,-467995871775,
 1757900019099,-6619846420551]

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Last modified June 17 20:03 EDT 2024. Contains 373464 sequences. (Running on oeis4.)