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.

A226931 Numerator of n + Sum(binomial(n,k)*(k/n)^k*((n-k)/n)^(n-k), k=0..n).

Table of values

n a(n)
1 3
2 9
3 53
4 231
5 5319
6 3167
7 1296273
8 1604979
9 64370707
10 22906587
11 411169704813
12 610433321
13 424312831956207
14 2146177886409
15 98731231639051
16 12218411169233691
17 1112291237880234922707
18 2196818399875253
19 2619031544578888560315813
20 16827894135040576041

List of values

[3, 9, 53, 231, 5319, 3167, 1296273, 1604979, 64370707, 22906587, 411169704813, 610433321, 424312831956207, 2146177886409, 98731231639051, 12218411169233691, 1112291237880234922707, 2196818399875253, 2619031544578888560315813, 16827894135040576041]