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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.

A027304 a(n) = Sum_{k=0..floor((n-5)/2)} T(n,k) * T(n,k+1), with T given by A008315.

Table of values

n a(n)
5 5
6 14
7 126
8 384
9 2355
10 7568
11 39545
12 131768
13 632177
14 2162510
15 9853892
16 34384064
17 151498203
18 536917884
19 2311543325
20 8295107912
21 35123988977
22 127340511540
23 532611748052
24 1947506206400
25 8069978842770
26 29721855687264
27 122273332182351
28 453128454670472

List of values

[5, 14, 126, 384, 2355, 7568, 39545, 131768, 632177, 2162510, 9853892, 34384064, 151498203, 536917884, 2311543325, 8295107912, 35123988977, 127340511540, 532611748052, 1947506206400, 8069978842770, 29721855687264, 122273332182351, 453128454670472]

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

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