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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.

A290879 E.g.f. L(x) of aerated sequence satisfies: L(x) = Integral 1 / sqrt( cosh(2*L(x)) ) dx.

Table of values

n a(n)
1 1
2 -2
3 44
4 -2840
5 367760
6 -79719200
7 26016555200
8 -11921650083200
9 7300922254496000
10 -5759532173685056000
11 5688335131502291840000
12 -6875441991877610827520000
13 9983390897443366347676160000
14 -17148197258942716354314368000000
15 34392433372153876998446324480000000
16 -79646680171456811546338888517120000000
17 210930739548407111241584046599398400000000

List of values

[1, -2, 44, -2840, 367760, -79719200, 26016555200, -11921650083200, 7300922254496000, -5759532173685056000, 5688335131502291840000, -6875441991877610827520000, 9983390897443366347676160000, -17148197258942716354314368000000, 34392433372153876998446324480000000, -79646680171456811546338888517120000000, 210930739548407111241584046599398400000000]

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

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