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.

A259533 Number of restricted barred preferential arrangements of an n-set having 3 bars in which 3 fixed sections are restricted sections and 1 section is a free section.

Table of values

n a(n)
0 1
1 4
2 18
3 94
4 582
5 4294
6 37398
7 378214
8 4366422
9 56697574
10 817979478
11 12981058534
12 224732536662
13 4214866778854
14 85130743747158
15 1842265527790054
16 42525237455785302
17 1042966136232956134
18 27084277306054500438
19 742412698554626764774
20 21421502369955072576342
21 648998599988032588957414

List of values

[1, 4, 18, 94, 582, 4294, 37398, 378214, 4366422, 56697574, 817979478, 12981058534, 224732536662, 4214866778854, 85130743747158, 1842265527790054, 42525237455785302, 1042966136232956134, 27084277306054500438, 742412698554626764774, 21421502369955072576342, 648998599988032588957414]

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

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