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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.

A099129 Let T(n) be the n-th triangular number n*(n+1)/2; then a(n) = n-th iteration T(T(T(...(n)))).

Table of values

n a(n)
0 0
1 1
2 6
3 231
4 1186570
5 347357071281165
6 2076895351339769460477611370186681
7 143892868802856286225154411591351342616163027795335641150249224655238508171

List of values

[0, 1, 6, 231, 1186570, 347357071281165, 2076895351339769460477611370186681, 143892868802856286225154411591351342616163027795335641150249224655238508171]

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

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