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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.

A191797 a(n) = binomial(F(n), 2) where F(n) = A000045(n).

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 3
5 10
6 28
7 78
8 210
9 561
10 1485
11 3916
12 10296
13 27028
14 70876
15 185745
16 486591
17 1274406
18 3337236
19 8738290
20 22879230
21 59901985
22 156830905
23 410597496
24 1074972528
25 2814337800
26 7368069528
27 19289917153
28 50501756955
29 132215475106
30 346144864780
31 906219437046

List of values

[0, 0, 0, 1, 3, 10, 28, 78, 210, 561, 1485, 3916, 10296, 27028, 70876, 185745, 486591, 1274406, 3337236, 8738290, 22879230, 59901985, 156830905, 410597496, 1074972528, 2814337800, 7368069528, 19289917153, 50501756955, 132215475106, 346144864780, 906219437046]

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

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