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.

A087449 a(n) = n * 4^(n-1) + (2*4^n + 1) / 3.

Table of values

n a(n)
0 1
1 4
2 19
3 91
4 427
5 1963
6 8875
7 39595
8 174763
9 764587
10 3320491
11 14330539
12 61516459
13 262843051
14 1118481067
15 4742359723
16 20043180715
17 84467690155
18 355050629803
19 1488921995947
20 6230565890731
21 26021775190699
22 108485147273899

List of values

[1, 4, 19, 91, 427, 1963, 8875, 39595, 174763, 764587, 3320491, 14330539, 61516459, 262843051, 1118481067, 4742359723, 20043180715, 84467690155, 355050629803, 1488921995947, 6230565890731, 26021775190699, 108485147273899]

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

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