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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.

A281580 a(n) = binomial(9*n, n-9).

Table of values

n a(n)
9 1
10 90
11 4851
12 204156
13 7413705
14 244222650
15 7511839335
16 219683466288
17 6183023199255
18 168899639028120
19 4505395859893071
20 117891537949758600
21 3036500678480436531
22 77190387796530738576
23 1940723247304668029175
24 48339506285032758609456
25 1194448077521704400002650

List of values

[1, 90, 4851, 204156, 7413705, 244222650, 7511839335, 219683466288, 6183023199255, 168899639028120, 4505395859893071, 117891537949758600, 3036500678480436531, 77190387796530738576, 1940723247304668029175, 48339506285032758609456, 1194448077521704400002650]

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

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