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.

A318793 Constant term in the expansion of (Sum_{k=0..n} k*(x^k + x^(-k)))^n.

Table of values

n a(n)
0 1
1 0
2 10
3 84
4 12060
5 922680
6 203474180
7 45546045720
8 16977056982648
9 7385901628225968
10 4359210462435545640
11 3063111491275816418020
12 2669859570203387710219500
13 2738752987417403052110951664
14 3328615281192062743163487239944

List of values

[1, 0, 10, 84, 12060, 922680, 203474180, 45546045720, 16977056982648, 7385901628225968, 4359210462435545640, 3063111491275816418020, 2669859570203387710219500, 2738752987417403052110951664, 3328615281192062743163487239944]

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

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