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.

A370280 Coefficient of x^n in the expansion of 1/( (1-x)^2 - x )^n.

Table of values

n a(n)
0 1
1 3
2 25
3 234
4 2305
5 23373
6 241486
7 2527920
8 26720529
9 284555700
10 3048323135
11 32812937820
12 354619072990
13 3845377105794
14 41817926091120
15 455893204069944
16 4980851709418353
17 54521955043418925
18 597823622561048020
19 6564929893462467450
20 72189820135528858455

List of values

[1, 3, 25, 234, 2305, 23373, 241486, 2527920, 26720529, 284555700, 3048323135, 32812937820, 354619072990, 3845377105794, 41817926091120, 455893204069944, 4980851709418353, 54521955043418925, 597823622561048020, 6564929893462467450, 72189820135528858455]

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

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