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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.

A053631 Pythagorean spiral: a(n-1)+1, a(n) and a(n)+1 are the sides of a right triangle (a primitive Pythagorean triangle).

Table of values

n a(n)
1 2
2 4
3 12
4 84
5 3612
6 6526884
7 21300113901612
8 226847426110843688722000884
9 25729877366557343481074291996721923093306518970391612
10 331013294649039928396936390888878360035026305412754995683702777533071737279144813617823976263475290370884

List of values

[2, 4, 12, 84, 3612, 6526884, 21300113901612, 226847426110843688722000884, 25729877366557343481074291996721923093306518970391612, 331013294649039928396936390888878360035026305412754995683702777533071737279144813617823976263475290370884]

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

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