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.

A382405 a(n) = Sum_{k=0..n} binomial(n,k)^2 * binomial(n+k,k) * 2^(n-k).

Table of values

n a(n)
0 1
1 4
2 34
3 352
4 4006
5 48184
6 600916
7 7687936
8 100240198
9 1326277144
10 17753591164
11 239915864896
12 3267780399196
13 44805617380528
14 617844108170344
15 8561667414341632
16 119151750609504838
17 1664497333624420888
18 23330380347342383404
19 327990673915214512192
20 4623496960858710060916

List of values

[1, 4, 34, 352, 4006, 48184, 600916, 7687936, 100240198, 1326277144, 17753591164, 239915864896, 3267780399196, 44805617380528, 617844108170344, 8561667414341632, 119151750609504838, 1664497333624420888, 23330380347342383404, 327990673915214512192, 4623496960858710060916]

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

Content is available under The OEIS End-User License Agreement.