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A215666 as a simple table

n a(n)
0 0
1 -3
2 6
3 -9
4 21
5 -33
6 72
7 -120
8 249
9 -432
10 867
11 -1545
12 3033
13 -5502
14 10644
15 -19539
16 37434
17 -69261
18 131841
19 -245217
20 464784
21 -867492
22 1639569
23 -3067260
24 5786199
25 -10841349
26 20425857
27 -38310246
28 72118920
29 -135356595
30 254667006
31 -478188705
32 899357613

[0,-3,6,-9,21,-33,72,-120,249,-432,867,-1545,3033,
 -5502,10644,-19539,37434,-69261,131841,-245217,
 464784,-867492,1639569,-3067260,5786199,-10841349,
 20425857,-38310246,72118920,-135356595,254667006,
 -478188705,899357613]

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Last modified March 29 08:13 EDT 2024. Contains 371265 sequences. (Running on oeis4.)