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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.

A175883 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k)|0 which never go above the line y=x.

Table of values

n a(n)
0 1
1 1
2 5
3 29
4 170
5 1093
6 7346
7 50957
8 362476
9 2629150
10 19371533
11 144585146
12 1090886362
13 8306621114
14 63752890716
15 492671044866
16 3830272606911
17 29937476853483
18 235104315621495
19 1854181694878573
20 14679397763545597
21 116619744085592959
22 929412502842262520

List of values

[1, 1, 5, 29, 170, 1093, 7346, 50957, 362476, 2629150, 19371533, 144585146, 1090886362, 8306621114, 63752890716, 492671044866, 3830272606911, 29937476853483, 235104315621495, 1854181694878573, 14679397763545597, 116619744085592959, 929412502842262520]

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

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