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.

A067121 a(n) = floor[X/Y] where X = the concatenation of the first n even numbers in increasing order and Y = their sum.

Table of values

n a(n)
1 1
2 4
3 20
4 123
5 8227
6 587643
7 44073235
8 3427918353
9 274233468240
10 22437283765107
11 1869773647092288
12 158211616292424373
13 13560995682207803419
14 1175286292458009629726
15 102837550590075842601095

List of values

[1, 4, 20, 123, 8227, 587643, 44073235, 3427918353, 274233468240, 22437283765107, 1869773647092288, 158211616292424373, 13560995682207803419, 1175286292458009629726, 102837550590075842601095]

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

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