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.

A151343 Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (1, -1), (1, 1)}.

Table of values

n a(n)
0 1
1 1
2 4
3 29
4 230
5 2034
6 19636
7 200219
8 2128690
9 23402066
10 264236768
11 3049648298
12 35848893160
13 428019644312
14 5179187934336
15 63402498105619
16 784107314998826
17 9784873540094834
18 123088167713040424
19 1559540214271770126
20 19887838197050534036
21 255108227918077438572
22 3289865618218314784376

List of values

[1, 1, 4, 29, 230, 2034, 19636, 200219, 2128690, 23402066, 264236768, 3049648298, 35848893160, 428019644312, 5179187934336, 63402498105619, 784107314998826, 9784873540094834, 123088167713040424, 1559540214271770126, 19887838197050534036, 255108227918077438572, 3289865618218314784376]

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

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