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.

A028340 Coefficient of x^3 in expansion of (x+1)*(x+3)*...*(x+2*n-1).

Table of values

n a(n)
3 1
4 16
5 230
6 3480
7 57379
8 1038016
9 20570444
10 444647600
11 10431670821
12 264300628944
13 7198061846898
14 209814739262856
15 6520139954328519
16 215245451727154944
17 7524314127912551832
18 277705505168550027360
19 10792700030471840300745
20 440604294676004639627280

List of values

[1, 16, 230, 3480, 57379, 1038016, 20570444, 444647600, 10431670821, 264300628944, 7198061846898, 209814739262856, 6520139954328519, 215245451727154944, 7524314127912551832, 277705505168550027360, 10792700030471840300745, 440604294676004639627280]

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

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