cp's OEIS Frontend

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.

A326253 Number of sequences of distinct ordered pairs of positive integers up to n.

Table of values

n a(n)
0 1
1 2
2 65
3 986410
4 56874039553217
5 42163840398198058854693626
6 1011182700521015817607065606491025592595137
7 1653481537585545171449931620186035466059689728986775126016505970

List of values

[1, 2, 65, 986410, 56874039553217, 42163840398198058854693626, 1011182700521015817607065606491025592595137, 1653481537585545171449931620186035466059689728986775126016505970]

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

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