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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.

A174958 a(n)=Sum((A008292(n - j, j) - C(n - j - 1, j))/2, j=0, [(n - 1)/2]).

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 1
5 4
6 15
7 56
8 214
9 854
10 3607
11 16172
12 76853
13 386082
14 2044198
15 11373124
16 66300473
17 403939612
18 2566116299
19 16962629860
20 116452790838
21 828903740138
22 6107712000563
23 46521422681724
24 365811331693305
25 2965957618809246
26 24767913121016790
27 212803409969904264

List of values

[0, 0, 0, 0, 1, 4, 15, 56, 214, 854, 3607, 16172, 76853, 386082, 2044198, 11373124, 66300473, 403939612, 2566116299, 16962629860, 116452790838, 828903740138, 6107712000563, 46521422681724, 365811331693305, 2965957618809246, 24767913121016790, 212803409969904264]

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

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