cp's OEIS Frontend

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.

A088556 Numbers of the form (4^n + 4^(n-1) + ... + 1) + (n mod 2).

Table of values

n a(n)
1 6
2 21
3 86
4 341
5 1366
6 5461
7 21846
8 87381
9 349526
10 1398101
11 5592406
12 22369621
13 89478486
14 357913941
15 1431655766
16 5726623061
17 22906492246
18 91625968981
19 366503875926
20 1466015503701
21 5864062014806
22 23456248059221
23 93824992236886
24 375299968947541
25 1501199875790166

List of values

[6, 21, 86, 341, 1366, 5461, 21846, 87381, 349526, 1398101, 5592406, 22369621, 89478486, 357913941, 1431655766, 5726623061, 22906492246, 91625968981, 366503875926, 1466015503701, 5864062014806, 23456248059221, 93824992236886, 375299968947541, 1501199875790166]

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

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