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.

A007889 Number of intransitive (or alternating, or Stanley) trees: vertices are [0,n] and for no i are both (i,j) and (j,k) edges.

Table of values

n a(n)
0 1
1 1
2 2
3 7
4 36
5 246
6 2104
7 21652
8 260720
9 3598120
10 56010096
11 971055240
12 18558391936
13 387665694976
14 8787898861568
15 214868401724416
16 5636819806209792
17 157935254554567296
18 4707152127520549120
19 148704074888134683520
20 4963548160096887021056
21 174553183413968718996736

List of values

[1, 1, 2, 7, 36, 246, 2104, 21652, 260720, 3598120, 56010096, 971055240, 18558391936, 387665694976, 8787898861568, 214868401724416, 5636819806209792, 157935254554567296, 4707152127520549120, 148704074888134683520, 4963548160096887021056, 174553183413968718996736]

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

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