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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.

A027284 a(n) = Sum_{k=0..2*n-2} T(n,k) * T(n,k+2), with T given by A026584.

Table of values

n a(n)
2 5
3 28
4 167
5 1024
6 6359
7 39759
8 249699
9 1573524
10 9943905
11 62994733
12 399936573
13 2543992514
14 16210331727
15 103453402718
16 661164765879
17 4230874777682
18 27105456280491
19 173838468040879
20 1115987495619427
21 7170725839251598
22 46113396476943241
23 296773029762031990

List of values

[5, 28, 167, 1024, 6359, 39759, 249699, 1573524, 9943905, 62994733, 399936573, 2543992514, 16210331727, 103453402718, 661164765879, 4230874777682, 27105456280491, 173838468040879, 1115987495619427, 7170725839251598, 46113396476943241, 296773029762031990]

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

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