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.

A197357 Number of n-digits integers for which the sum of the odd-positioned digits equals the sum of the even-positioned digits.

Table of values

n a(n)
1 1
2 10
3 55
4 670
5 4840
6 55252
7 436975
8 4816030
9 40051495
10 432457640
11 3715101654
12 39581170420
13 347847754670
14 3671331273480
15 32811494188975
16 343900019857310
17 3113537578058979
18 32458256583753952
19 296896918816556380
20 3081918923741896840

List of values

[1, 10, 55, 670, 4840, 55252, 436975, 4816030, 40051495, 432457640, 3715101654, 39581170420, 347847754670, 3671331273480, 32811494188975, 343900019857310, 3113537578058979, 32458256583753952, 296896918816556380, 3081918923741896840]

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

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