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A009804 as a simple table

n a(n)
0 0
1 1
2 2
3 2
4 -16
5 -168
6 -928
7 -880
8 57472
9 897792
10 7304192
11 -4100864
12 -1356949504
13 -27044864000
14 -271226560512
15 1097459304448
16 114089524002816
17 2671773715300352
18 29775666324832256
19 -316640482329755648

[0,1,2,2,-16,-168,-928,-880,57472,897792,7304192,
 -4100864,-1356949504,-27044864000,-271226560512,
 1097459304448,114089524002816,2671773715300352,
 29775666324832256,-316640482329755648]

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Last modified March 2 21:56 EST 2024. Contains 370498 sequences. (Running on oeis4.)