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.

A384415 a(n) = 4^n - 3^n - n*3^(n-1) - binomial(n,2)*3^(n-2).

Table of values

n a(n)
0 0
1 0
2 0
3 1
4 13
5 106
6 694
7 3991
8 21067
9 104680
10 497452
11 2285053
12 10222777
13 44788342
14 192970834
15 820244467
16 3448381783
17 14367483412
18 59421385000
19 244271688313
20 999169721125
21 4070288777410
22 16525230017710
23 66906367267471
24 270271938430243

List of values

[0, 0, 0, 1, 13, 106, 694, 3991, 21067, 104680, 497452, 2285053, 10222777, 44788342, 192970834, 820244467, 3448381783, 14367483412, 59421385000, 244271688313, 999169721125, 4070288777410, 16525230017710, 66906367267471, 270271938430243]