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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.

A279511 Sierpinski square-based pyramid numbers: a(n) = 5*a(n-1) - (2^(n+1)+7).

Table of values

n a(n)
0 5
1 14
2 55
3 252
4 1221
5 6034
6 30035
7 149912
8 749041
9 3744174
10 18718815
11 93589972
12 467941661
13 2339691914
14 11698426795
15 58492068432
16 292460211081
17 1462300793254
18 7311503441975
19 36557516161292
20 182787578709301
21 913937889352194
22 4569689438372355
23 22848447175084552

List of values

[5, 14, 55, 252, 1221, 6034, 30035, 149912, 749041, 3744174, 18718815, 93589972, 467941661, 2339691914, 11698426795, 58492068432, 292460211081, 1462300793254, 7311503441975, 36557516161292, 182787578709301, 913937889352194, 4569689438372355, 22848447175084552]

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

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