cp's OEIS Frontend

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.

A247499 a(n) = hypergeom([1, -n, -n-1], [2], 1).

Table of values

n a(n)
0 1
1 2
2 6
3 25
4 135
5 896
6 7042
7 63841
8 654901
9 7491574
10 94470926
11 1301130777
12 19423173211
13 312256205652
14 5376809244458
15 98700795776641
16 1923638785344457
17 39661911384761866
18 862362968121278038
19 19717031047061570777
20 472849461034147171791
21 11866892471399392308232

List of values

[1, 2, 6, 25, 135, 896, 7042, 63841, 654901, 7491574, 94470926, 1301130777, 19423173211, 312256205652, 5376809244458, 98700795776641, 1923638785344457, 39661911384761866, 862362968121278038, 19717031047061570777, 472849461034147171791, 11866892471399392308232]

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

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