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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.

A243315 Number of ways to reciprocally link elements of an n X 9 array either to themselves or to exactly one king-move neighbor.

Table of values

n a(n)
0 1
1 55
2 237472
3 371654153
4 757341382671
5 1450226501771584
6 2820152941289640505
7 5463664833842177843423
8 10594819370472223969569120
9 20540255065209806005525289313
10 39823725482559144291828665014967
11 77209746313875957204633819730760448

List of values

[1, 55, 237472, 371654153, 757341382671, 1450226501771584, 2820152941289640505, 5463664833842177843423, 10594819370472223969569120, 20540255065209806005525289313, 39823725482559144291828665014967, 77209746313875957204633819730760448]

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

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