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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.

A274277 E.g.f. A(x) satisfies: A( A(x)^2 ) = x^2 * exp(-2*x).

Table of values

n a(n)
1 1
2 -2
3 6
4 -40
5 320
6 -2976
7 35392
8 -538112
9 9931392
10 -211790080
11 5059784576
12 -132643057152
13 3761875287040
14 -114501941915648
15 3725395402721280
16 -129324055589257216
17 4786638435256696832
18 -188785468724361560064
19 7922155381738193944576
20 -352740315643746941665280
21 16603695476218208847691776
22 -822951583413551750366298112
23 42792449844854211313594597376
24 -2327246576567999111735900897280
25 132052357036729088907927420928000

List of values

[1, -2, 6, -40, 320, -2976, 35392, -538112, 9931392, -211790080, 5059784576, -132643057152, 3761875287040, -114501941915648, 3725395402721280, -129324055589257216, 4786638435256696832, -188785468724361560064, 7922155381738193944576, -352740315643746941665280, 16603695476218208847691776, -822951583413551750366298112, 42792449844854211313594597376, -2327246576567999111735900897280, 132052357036729088907927420928000]

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

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