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.

A280939 Expansion of e.g.f.: 2*sinh(x/2) / sqrt(2 - exp(x)).

Table of values

n a(n)
1 1
2 1
3 4
4 19
5 121
6 946
7 8779
8 94249
9 1148746
10 15667741
11 236396029
12 3909054304
13 70297156021
14 1365847397461
15 28512838809004
16 636437585232559
17 15125744356058821
18 381337518656892106
19 10164860714961807079
20 285635253778131491389
21 8438962752941736017146
22 261512261403795336646801
23 8481542634943973943517129
24 287325556922319462615912544
25 10148442521179099638781764121

List of values

[1, 1, 4, 19, 121, 946, 8779, 94249, 1148746, 15667741, 236396029, 3909054304, 70297156021, 1365847397461, 28512838809004, 636437585232559, 15125744356058821, 381337518656892106, 10164860714961807079, 285635253778131491389, 8438962752941736017146, 261512261403795336646801, 8481542634943973943517129, 287325556922319462615912544, 10148442521179099638781764121]

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

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