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.

A277358 Number of self-avoiding planar walks starting at (0,0), ending at (n,0), remaining in the first quadrant and using steps (0,1), (1,0), (1,1), (-1,1), and (1,-1).

Table of values

n a(n)
0 1
1 2
2 9
3 58
4 491
5 5142
6 64159
7 929078
8 15314361
9 283091122
10 5799651689
11 130423248378
12 3193954129651
13 84607886351462
14 2410542221526399
15 73500777054712438
16 2388182999073694001
17 82374234401380995042
18 3006071549433968619529
19 115713455097715665452858

List of values

[1, 2, 9, 58, 491, 5142, 64159, 929078, 15314361, 283091122, 5799651689, 130423248378, 3193954129651, 84607886351462, 2410542221526399, 73500777054712438, 2388182999073694001, 82374234401380995042, 3006071549433968619529, 115713455097715665452858]