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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.

A061580 a(1) = 1, a(n)= number obtained by replacing each digit of a(n-1) with four times its value.

Table of values

n a(n)
1 1
2 4
3 16
4 424
5 16816
6 42432424
7 1681612816816
8 42432424483242432424
9 168161281681616321281681612816816
10 42432424483242432424424128483242432424483242432424

List of values

[1, 4, 16, 424, 16816, 42432424, 1681612816816, 42432424483242432424, 168161281681616321281681612816816, 42432424483242432424424128483242432424483242432424]

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

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