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.

A326920 Constant term in the expansion of (-1 + Product_{k=1..n} (1 + x_k + 1/x_k))^n.

Table of values

n a(n)
0 1
1 0
2 8
3 264
4 121200
5 332810400
6 7753173594200
7 1440193875113407680
8 2250630808138439243100640
9 29565964235758317208187044137600
10 3307988125501026209547184198622507128848
11 3165738749695300492286911657015518806826344524560

List of values

[1, 0, 8, 264, 121200, 332810400, 7753173594200, 1440193875113407680, 2250630808138439243100640, 29565964235758317208187044137600, 3307988125501026209547184198622507128848, 3165738749695300492286911657015518806826344524560]

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

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