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.

A340838 a(n) = (1/2) * Sum_{k>=0} (k*(k + n))^n / 2^k.

Table of values

n a(n)
0 1
1 4
2 139
3 11928
4 1909787
5 491329088
6 185373016419
7 96425597012608
8 66139668570414571
9 57840395870803141632
10 62813828698519808489915
11 82933938539372018962724864
12 130828514220436815006398809563
13 243020960809424084526916839817216
14 525038425527430196237626528753654867

List of values

[1, 4, 139, 11928, 1909787, 491329088, 185373016419, 96425597012608, 66139668570414571, 57840395870803141632, 62813828698519808489915, 82933938539372018962724864, 130828514220436815006398809563, 243020960809424084526916839817216, 525038425527430196237626528753654867]