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.

A051055 'Connected' alternating sign n X n matrices, i.e., not made from smaller blocks.

Table of values

n a(n)
0 0
1 1
2 0
3 1
4 2
5 59
6 1092
7 51412
8 3420384
9 382912420
10 68021283668
11 19474443244283
12 9025228384142396
13 6825775070789988992
14 8486240219059861120000
15 17454179683586670023001218
16 59698062960218238908531091872

List of values

[0, 1, 0, 1, 2, 59, 1092, 51412, 3420384, 382912420, 68021283668, 19474443244283, 9025228384142396, 6825775070789988992, 8486240219059861120000, 17454179683586670023001218, 59698062960218238908531091872]

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

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