cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A163982 Real part of the coefficient [x^n] of the expansion of (1+i)/(1-i*exp(x)) - 1 multiplied by 2*n!, where i is the imaginary unit.

Table of values

n a(n)
0 -2
1 -1
2 1
3 2
4 -5
5 -16
6 61
7 272
8 -1385
9 -7936
10 50521
11 353792
12 -2702765
13 -22368256
14 199360981
15 1903757312
16 -19391512145
17 -209865342976
18 2404879675441
19 29088885112832
20 -370371188237525
21 -4951498053124096
22 69348874393137901

List of values

[-2, -1, 1, 2, -5, -16, 61, 272, -1385, -7936, 50521, 353792, -2702765, -22368256, 199360981, 1903757312, -19391512145, -209865342976, 2404879675441, 29088885112832, -370371188237525, -4951498053124096, 69348874393137901]