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.

A290058 Number of X-rays of n X n binary matrices with exactly floor(n^2/2) ones.

Table of values

n a(n)
0 1
1 1
2 4
3 30
4 440
5 9892
6 331950
7 15121926
8 915201732
9 70120569074
10 6696969703276
11 774618119733020
12 107284227278413622
13 17455779156567652806
14 3307802489634916900474
15 720231707823173636419042
16 178973636259170839478327332
17 50249140887232774758578932120

List of values

[1, 1, 4, 30, 440, 9892, 331950, 15121926, 915201732, 70120569074, 6696969703276, 774618119733020, 107284227278413622, 17455779156567652806, 3307802489634916900474, 720231707823173636419042, 178973636259170839478327332, 50249140887232774758578932120]

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

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