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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.

A175891 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
4 185
5 1226
6 8553
7 61642
8 455337
9 3429002
10 26229691
11 203237747
12 1591820564
13 12582288455
14 100241042348
15 804090987555
16 6488942266564
17 52644171729304
18 429123506792664
19 3512829202462126
20 28866426741057006
21 238031465396515626
22 1969001793889730276

List of values

[1, 1, 5, 29, 185, 1226, 8553, 61642, 455337, 3429002, 26229691, 203237747, 1591820564, 12582288455, 100241042348, 804090987555, 6488942266564, 52644171729304, 429123506792664, 3512829202462126, 28866426741057006, 238031465396515626, 1969001793889730276]

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

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