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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.

A212500 a(n) is the difference between multiples of 5 with even and odd digit sum in base 4 in interval [0,4^n).

Table of values

n a(n)
1 1
2 4
3 7
4 36
5 65
6 340
7 615
8 3220
9 5825
10 30500
11 55175
12 288900
13 522625
14 2736500
15 4950375
16 25920500
17 46890625
18 245522500
19 444154375
20 2325622500
21 4207090625
22 22028612500
23 39850134375
24 208658012500
25 377465890625
26 1976437062500
27 3575408234375

List of values

[1, 4, 7, 36, 65, 340, 615, 3220, 5825, 30500, 55175, 288900, 522625, 2736500, 4950375, 25920500, 46890625, 245522500, 444154375, 2325622500, 4207090625, 22028612500, 39850134375, 208658012500, 377465890625, 1976437062500, 3575408234375]

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

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