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.

A378564 a(n) is the number of n-digit nonnegative integers with the median of the digits equal to one of the digits.

Table of values

n a(n)
1 10
2 9
3 900
4 1665
5 90000
6 232710
7 9000000
8 29055165
9 900000000
10 3413319138
11 90000000000
12 386095933170
13 9000000000000
14 42568084276236
15 900000000000000
16 4607838122919165
17 90000000000000000
18 491998811785538730
19 9000000000000000000
20 51983526276872387430
21 900000000000000000000
22 5447302810160797285236

List of values

[10, 9, 900, 1665, 90000, 232710, 9000000, 29055165, 900000000, 3413319138, 90000000000, 386095933170, 9000000000000, 42568084276236, 900000000000000, 4607838122919165, 90000000000000000, 491998811785538730, 9000000000000000000, 51983526276872387430, 900000000000000000000, 5447302810160797285236]

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

Content is available under The OEIS End-User License Agreement.