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.

A379823 a(n) = (-1)^n * hypergeom([-n, n/2 + 1, n/2 + 1/2], [1, n + 2], 4). Central terms of A379907.

Table of values

n a(n)
0 1
1 1
2 4
3 17
4 76
5 352
6 1667
7 8017
8 38992
9 191276
10 944648
11 4690688
12 23396023
13 117130483
14 588267604
15 2962532945
16 14954741680
17 75647585152
18 383359922324
19 1945925312492
20 9891894347360
21 50350481125000
22 256592858798416
23 1309047896676352
24 6684914267741951
25 34168808617063927

List of values

[1, 1, 4, 17, 76, 352, 1667, 8017, 38992, 191276, 944648, 4690688, 23396023, 117130483, 588267604, 2962532945, 14954741680, 75647585152, 383359922324, 1945925312492, 9891894347360, 50350481125000, 256592858798416, 1309047896676352, 6684914267741951, 34168808617063927]

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

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