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A014986 as a simple table

n a(n)
1 1
2 -4
3 21
4 -104
5 521
6 -2604
7 13021
8 -65104
9 325521
10 -1627604
11 8138021
12 -40690104
13 203450521
14 -1017252604
15 5086263021
16 -25431315104
17 127156575521
18 -635782877604
19 3178914388021
20 -15894571940104
21 79472859700521

[1,-4,21,-104,521,-2604,13021,-65104,325521,
 -1627604,8138021,-40690104,203450521,-1017252604,
 5086263021,-25431315104,127156575521,
 -635782877604,3178914388021,-15894571940104,
 79472859700521]

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