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.

A220568 Number of ways to reciprocally link elements of an 7Xn array either to themselves or to exactly one horizontal or antidiagonal neighbor.

Table of values

n a(n)
1 1
2 610
3 27716
4 3128843
5 252139015
6 22926570957
7 1996515036228
8 176531479976571
9 15526120567015962
10 1368042952494285120
11 120466174602717968172
12 10610162775514570773634
13 934433508779628038701082

List of values

[1, 610, 27716, 3128843, 252139015, 22926570957, 1996515036228, 176531479976571, 15526120567015962, 1368042952494285120, 120466174602717968172, 10610162775514570773634, 934433508779628038701082]

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

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