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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.

A386227 Expansion of e.g.f. cosh(x)^2*(1 + x + x^2/2).

Table of values

n a(n)
0 1
1 1
2 3
3 6
4 20
5 40
6 152
7 224
8 1024
9 1152
10 6272
11 5632
12 35840
13 26624
14 194560
15 122880
16 1015808
17 557056
18 5144576
19 2490368
20 25427968
21 11010048
22 123207680
23 48234496
24 587202560
25 209715200
26 2759852032
27 905969664
28 12817793024
29 3892314112
30 58921582592
31 16642998272
32 268435456000
33 70866960384

List of values

[1, 1, 3, 6, 20, 40, 152, 224, 1024, 1152, 6272, 5632, 35840, 26624, 194560, 122880, 1015808, 557056, 5144576, 2490368, 25427968, 11010048, 123207680, 48234496, 587202560, 209715200, 2759852032, 905969664, 12817793024, 3892314112, 58921582592, 16642998272, 268435456000, 70866960384]

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

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