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.

A228511 a(n) = sum_{k=0}^n binomial(n,k)^2*4^k*A000108(k).

Table of values

n a(n)
0 1
1 5
2 49
3 645
4 9921
5 167909
6 3030705
7 57284901
8 1120905985
9 22531796805
10 462793508529
11 9674942743365
12 205261950829761
13 4409503432713765
14 95746612458475569
15 2098428359692863717
16 46366172896708865025
17 1031886636204630031493
18 23112239140054942651185
19 520644236358436868354565
20 11789139538117859937032385

List of values

[1, 5, 49, 645, 9921, 167909, 3030705, 57284901, 1120905985, 22531796805, 462793508529, 9674942743365, 205261950829761, 4409503432713765, 95746612458475569, 2098428359692863717, 46366172896708865025, 1031886636204630031493, 23112239140054942651185, 520644236358436868354565, 11789139538117859937032385]