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.

A192370 Sum of all the n-digit numbers whose digits are all even and nonzero: 2,4,6,8.

Table of values

n a(n)
1 20
2 880
3 35520
4 1422080
5 56888320
6 2275553280
7 91022213120
8 3640888852480
9 145635555409920
10 5825422221639680
11 233016888886558720
12 9320675555546234880
13 372827022222184939520
14 14913080888888739758080
15 596523235555554959032320
16 23860929422222219836129280

List of values

[20, 880, 35520, 1422080, 56888320, 2275553280, 91022213120, 3640888852480, 145635555409920, 5825422221639680, 233016888886558720, 9320675555546234880, 372827022222184939520, 14913080888888739758080, 596523235555554959032320, 23860929422222219836129280]

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

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