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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.

A372421 Number of steps required to kill the hydra in a version of the hydra game (see comments) where the rightmost head is chopped off in each step and new heads are grown to the left.

Table of values

n a(n)
0 0
1 1
2 3
3 9
4 49
5 1230
6 757071
7 286578628063
8 41063655031378934880024
9 843111882268046256673111236649909091104560309
10 355418823010783945962646271385485944012152784388172734299894340514265378207290093661367905

List of values

[0, 1, 3, 9, 49, 1230, 757071, 286578628063, 41063655031378934880024, 843111882268046256673111236649909091104560309, 355418823010783945962646271385485944012152784388172734299894340514265378207290093661367905]

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

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