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A001938 as a simple table

n a(n)
0 1
1 -4
2 14
3 -40
4 101
5 -236
6 518
7 -1080
8 2162
9 -4180
10 7840
11 -14328
12 25591
13 -44776
14 76918
15 -129952
16 216240
17 -354864
18 574958
19 -920600
20 1457946
21 -2285452
22 3548550
23 -5460592
24 8332425
25 -12614088
26 18953310
27 -28276968
28 41904208
29 -61702876
30 90304598
31 -131399624

[1,-4,14,-40,101,-236,518,-1080,2162,-4180,7840,
 -14328,25591,-44776,76918,-129952,216240,-354864,
 574958,-920600,1457946,-2285452,3548550,-5460592,
 8332425,-12614088,18953310,-28276968,41904208,
 -61702876,90304598,-131399624]

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Last modified March 29 04:23 EDT 2024. Contains 371264 sequences. (Running on oeis4.)