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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.

A027285 a(n) = Sum_{k=0..2*n-3} T(n,k) * T(n,k+3), with T given by A026584.

Table of values

n a(n)
3 12
4 116
5 682
6 4908
7 30272
8 201648
9 1273286
10 8275894
11 52783298
12 340392020
13 2180905198
14 14035736838
15 90149817980
16 580197442656
17 3732734480794
18 24041345351898
19 154874693823022
20 998441294531516
21 6439238635990250
22 41552345665859196
23 268252644944872486

List of values

[12, 116, 682, 4908, 30272, 201648, 1273286, 8275894, 52783298, 340392020, 2180905198, 14035736838, 90149817980, 580197442656, 3732734480794, 24041345351898, 154874693823022, 998441294531516, 6439238635990250, 41552345665859196, 268252644944872486]

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

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