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.

A358109 a(n) = 16^n * Sum_{k=0..n} binomial(1/2, k)^2 * binomial(n, k).

Table of values

n a(n)
0 1
1 20
2 388
3 7376
4 138340
5 2572880
6 47652240
7 882388800
8 16402291620
9 307411770320
10 5837516987920
11 112918906836800
12 2237687548230160
13 45677390764531520
14 964818477552462400
15 21148251536958233856
16 481370160754727691300
17 11360399185583414128848
18 277079154699775861823376

List of values

[1, 20, 388, 7376, 138340, 2572880, 47652240, 882388800, 16402291620, 307411770320, 5837516987920, 112918906836800, 2237687548230160, 45677390764531520, 964818477552462400, 21148251536958233856, 481370160754727691300, 11360399185583414128848, 277079154699775861823376]

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

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