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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.

A379866 Expansion of e.g.f. (1/x) * Series_Reversion( x / (exp(-x) + x)^2 ).

Table of values

n a(n)
0 1
1 0
2 2
3 -2
4 56
5 -222
6 5332
7 -45782
8 1127408
9 -15972542
10 428055644
11 -8598013734
12 256717806952
13 -6667767637598
14 223389539254676
15 -7076616268104278
16 265762684840216544
17 -9880557234248622462
18 413902270494309471436
19 -17591536945041528005318
20 816621849842712202724696

List of values

[1, 0, 2, -2, 56, -222, 5332, -45782, 1127408, -15972542, 428055644, -8598013734, 256717806952, -6667767637598, 223389539254676, -7076616268104278, 265762684840216544, -9880557234248622462, 413902270494309471436, -17591536945041528005318, 816621849842712202724696]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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