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.

A083008 a(n) = Sum_{k=0..n-1} 4^k*B(k)*C(n,k) where B(k) is the k-th Bernoulli number and C(n,k) = binomial(n,k).

Table of values

n a(n)
0 0
1 1
2 -3
3 3
4 9
5 -25
6 -99
7 427
8 2193
9 -12465
10 -79515
11 555731
12 4247577
13 -35135945
14 -313193811
15 2990414715
16 30461046561
17 -329655706465
18 -3777604994187
19 45692713833379
20 581778811909545
21 -7777794952988025
22 -108933009112011843
23 1595024111042171723
24 24370176181315498929

List of values

[0, 1, -3, 3, 9, -25, -99, 427, 2193, -12465, -79515, 555731, 4247577, -35135945, -313193811, 2990414715, 30461046561, -329655706465, -3777604994187, 45692713833379, 581778811909545, -7777794952988025, -108933009112011843, 1595024111042171723, 24370176181315498929]