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.

A225877 Number of (2n-1)-step self-avoiding paths between two adjacent sites of a 2-dimensional square lattice.

Table of values

n a(n)
1 1
2 2
3 6
4 28
5 140
6 744
7 4116
8 23504
9 137412
10 818260
11 4945292
12 30255240
13 187009888
14 1166065936
15 7325767920
16 46326922560
17 294658864188
18 1883761686216
19 12098003064296
20 78015400052920
21 504955502402148
22 3279315915221192
23 21361995729759184
24 139545638718942960

List of values

[1, 2, 6, 28, 140, 744, 4116, 23504, 137412, 818260, 4945292, 30255240, 187009888, 1166065936, 7325767920, 46326922560, 294658864188, 1883761686216, 12098003064296, 78015400052920, 504955502402148, 3279315915221192, 21361995729759184, 139545638718942960]

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

Content is available under The OEIS End-User License Agreement.