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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.

A245138 E.g.f.: (cosh(x) + sinh(x)*cosh(2*x)) / sqrt(1 - sinh(x)^2*sinh(2*x)^2).

Table of values

n a(n)
0 1
1 1
2 1
3 13
4 49
5 361
6 3121
7 39733
8 409249
9 6410641
10 91979041
11 1716516253
12 29795642449
13 660718214521
14 13656276138961
15 345794520085573
16 8290832204163649
17 237409681243284001
18 6465138777774530881
19 206263448435258395693
20 6296129943088315156849
21 221484543685548532051081

List of values

[1, 1, 1, 13, 49, 361, 3121, 39733, 409249, 6410641, 91979041, 1716516253, 29795642449, 660718214521, 13656276138961, 345794520085573, 8290832204163649, 237409681243284001, 6465138777774530881, 206263448435258395693, 6296129943088315156849, 221484543685548532051081]

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

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