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.

A046612 Distinct numbers in writing first numerator and then denominator of the central elements of the 1/5-Pascal triangle (by row).

Table of values

n a(n)
1 1
2 5
3 12
4 46
5 34
6 126
7 2352
8 8844
9 33462
10 25454
11 97240
12 1864356
13 7171892
14 27665596
15 21395520
16 82907640
17 321868854
18 1251661518
19 4874644104
20 19010020260
21 74225053980
22 290134122564
23 1135234789728
24 4446052592904
25 17427428373420

List of values

[1, 5, 12, 46, 34, 126, 2352, 8844, 33462, 25454, 97240, 1864356, 7171892, 27665596, 21395520, 82907640, 321868854, 1251661518, 4874644104, 19010020260, 74225053980, 290134122564, 1135234789728, 4446052592904, 17427428373420]

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

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