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A111640 as a simple table

n a(n)
0 1
1 -9
2 45
3 -195
4 793
5 -3117
6 12013
7 -45751
8 172961
9 -650849
10 2441917
11 -9144539
12 34203161
13 -127829669
14 477505565
15 -1783134255
16 6657304833
17 -24851573497
18 92762239373
19 -346229372851
20 1292232479961
21 -4822886991709
22 17999765604237
23 -67177262104679
24 250711906290721

[1,-9,45,-195,793,-3117,12013,-45751,172961,
 -650849,2441917,-9144539,34203161,-127829669,
 477505565,-1783134255,6657304833,-24851573497,
 92762239373,-346229372851,1292232479961,
 -4822886991709,17999765604237,-67177262104679,
 250711906290721]

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Last modified April 18 07:59 EDT 2021. Contains 343084 sequences. (Running on oeis4.)