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.

A212271 Number of ways to place k non-attacking ferses on an n x n cylindrical chessboard, summed over all k >= 0.

Table of values

n a(n)
1 2
2 9
3 80
4 1600
5 79033
6 8156736
7 2055960192
8 1108756350625
9 1411080429618656
10 3943472747846953216
11 25425527581172360096017
12 365481944233773616212640000
13 11980566143208960475692367828480
14 882106482533191605447029340350009049
15 147314997388032765439791110273770608260928

List of values

[2, 9, 80, 1600, 79033, 8156736, 2055960192, 1108756350625, 1411080429618656, 3943472747846953216, 25425527581172360096017, 365481944233773616212640000, 11980566143208960475692367828480, 882106482533191605447029340350009049, 147314997388032765439791110273770608260928]

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

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