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.

A251661 a(n) = Sum_{k=0..n} C(n,k) * (2^k + 3^k)^(n-k).

Table of values

n a(n)
0 1
1 3
2 15
3 123
4 1671
5 37863
6 1447515
7 93965763
8 10456301871
9 2001375249423
10 663553617119475
11 381265346343864843
12 381607689867265672551
13 664239239404717367975223
14 2018751151993358704057734795
15 10680818706115450217386068210963
16 98710608829560784063971722066895711

List of values

[1, 3, 15, 123, 1671, 37863, 1447515, 93965763, 10456301871, 2001375249423, 663553617119475, 381265346343864843, 381607689867265672551, 664239239404717367975223, 2018751151993358704057734795, 10680818706115450217386068210963, 98710608829560784063971722066895711]