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A216878 as a simple table

n a(n)
0 1
1 -1
2 1
3 -3
4 6
5 -17
6 43
7 -125
8 348
9 -1029
10 3020
11 -9116
12 27567
13 -84620
14 260949
15 -812053
16 2539208
17 -7989121
18 25244540
19 -80136851
20 255325972
21 -816447638
22 2618870068
23 -8425244209
24 27176810469
25 -87879769383
26 284813417885
27 -925013053556
28 3010106492409
29 -9813119711706

[1,-1,1,-3,6,-17,43,-125,348,-1029,3020,-9116,
 27567,-84620,260949,-812053,2539208,-7989121,
 25244540,-80136851,255325972,-816447638,
 2618870068,-8425244209,27176810469,-87879769383,
 284813417885,-925013053556,3010106492409,
 -9813119711706]

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Last modified January 23 13:20 EST 2022. Contains 350511 sequences. (Running on oeis4.)