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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.

A175900 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
4 411
5 3150
6 25274
7 209719
8 1784909
9 15495058
10 136672624
11 1221370092
12 11034687854
13 100623850938
14 924917387599
15 8560734224711
16 79717622732369
17 746322905220237
18 7020573752016609
19 66324819580927731
20 629004053328092981

List of values

[1, 2, 9, 57, 411, 3150, 25274, 209719, 1784909, 15495058, 136672624, 1221370092, 11034687854, 100623850938, 924917387599, 8560734224711, 79717622732369, 746322905220237, 7020573752016609, 66324819580927731, 629004053328092981]

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

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