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.

A156235 Number of irreflexive binary relations on the power set P(N) of an n-element set N as restricted below.

Table of values

n	a(n)
0	1
1	1
2	4
3	198
4	209342

List of values

[1, 1, 4, 198, 209342]

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

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