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.

A240688 Expansion of -(x*sqrt(-4*x^2-4*x+1)-2*x^2-3*x) / ((x+1)*sqrt(-4*x^2-4*x+1)+ 4*x^3+8*x^2+3*x-1).

Table of values

n a(n)
0 1
1 1
2 5
3 19
4 81
5 351
6 1553
7 6959
8 31489
9 143551
10 658305
11 3033471
12 14034177
13 65147135
14 303285505
15 1415422719
16 6620053505
17 31021657087
18 145613977601
19 684537354239
20 3222408929281
21 15187861143551
22 71663163121665

List of values

[1, 1, 5, 19, 81, 351, 1553, 6959, 31489, 143551, 658305, 3033471, 14034177, 65147135, 303285505, 1415422719, 6620053505, 31021657087, 145613977601, 684537354239, 3222408929281, 15187861143551, 71663163121665]

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

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