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.

A225621 Central terms of the triangle in A074911.

Table of values

n a(n)
1 1
2 4
3 20
4 108
5 632
6 4060
7 28968
8 231000
9 2058096
10 20375964
11 222393800
12 2653879624
13 34365597840
14 479776469848
15 7181892528272
16 114731622081840
17 1948073992109280
18 35031456100431900
19 665075537735997960
20 13292908401187179240
21 279000321119414475600

List of values

[1, 4, 20, 108, 632, 4060, 28968, 231000, 2058096, 20375964, 222393800, 2653879624, 34365597840, 479776469848, 7181892528272, 114731622081840, 1948073992109280, 35031456100431900, 665075537735997960, 13292908401187179240, 279000321119414475600]

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

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