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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.

A259317 a(n) = 2*(2*n+1)*A000538(n) - 4*A000330(n)^2.

Table of values

n a(n)
0 0
1 2
2 70
3 588
4 2772
5 9438
6 26026
7 61880
8 131784
9 257754
10 471086
11 814660
12 1345500
13 2137590
14 3284946
15 4904944
16 7141904
17 10170930
18 14202006
19 19484348
20 26311012
21 35023758
22 46018170
23 59749032
24 76735960
25 97569290
26 122916222
27 153527220
28 190242668
29 233999782

List of values

[0, 2, 70, 588, 2772, 9438, 26026, 61880, 131784, 257754, 471086, 814660, 1345500, 2137590, 3284946, 4904944, 7141904, 10170930, 14202006, 19484348, 26311012, 35023758, 46018170, 59749032, 76735960, 97569290, 122916222, 153527220, 190242668, 233999782]

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

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