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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.

A203511 a(n) = Product_{1 <= i < j <= n} (t(i) + t(j)); t = A000217 = triangular numbers.

Table of values

n a(n)
0 1
1 1
2 4
3 252
4 576576
5 87178291200
6 1386980110791475200
7 3394352757964564324299571200
8 1760578659300452732262852600316664217600
9 255323290537547288382098619855584488593426606981120000

List of values

[1, 1, 4, 252, 576576, 87178291200, 1386980110791475200, 3394352757964564324299571200, 1760578659300452732262852600316664217600, 255323290537547288382098619855584488593426606981120000]

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

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