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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.

A024175 Expansion of g.f. (x^3 - 6*x^2 + 5*x - 1)/((2*x - 1)*(2*x^2 - 4*x + 1)).

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 14
5 42
6 132
7 428
8 1416
9 4744
10 16016
11 54320
12 184736
13 629280
14 2145600
15 7319744
16 24979584
17 85262464
18 291057920
19 993641216
20 3392317952
21 11581727232
22 39541748736
23 135002491904
24 460924372992
25 1573688313856
26 5372896120832
27 18344191078400
28 62630938517504

List of values

[1, 1, 2, 5, 14, 42, 132, 428, 1416, 4744, 16016, 54320, 184736, 629280, 2145600, 7319744, 24979584, 85262464, 291057920, 993641216, 3392317952, 11581727232, 39541748736, 135002491904, 460924372992, 1573688313856, 5372896120832, 18344191078400, 62630938517504]

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

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