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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.

A175896 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(1,1)|0 which never go above the line y-x.

Table of values

n a(n)
0 1
1 2
2 9
3 57
4 396
5 2948
6 23016
7 185838
8 1539066
9 13001677
10 111600446
11 970550862
12 8533427593
13 75728797781
14 677427655798
15 6102015206945
16 55299451023428
17 503847366381836
18 4612663920303329
19 42409513650507927
20 391425863599784588

List of values

[1, 2, 9, 57, 396, 2948, 23016, 185838, 1539066, 13001677, 111600446, 970550862, 8533427593, 75728797781, 677427655798, 6102015206945, 55299451023428, 503847366381836, 4612663920303329, 42409513650507927, 391425863599784588]

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

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