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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.

A380024 a(n) = 4^n - 3^n - binomial(n,2)*3^(n-2).

Table of values

n a(n)
0 0
1 1
2 6
3 28
4 121
5 511
6 2152
7 9094
8 38563
9 163729
10 694282
11 2934592
12 12348541
13 51697075
14 215291356
15 891989002
16 3677964295
17 15099277669
18 61745907934
19 251632677604
20 1022414950465
21 4143511249831
22 16755357788176
23 67628131638478
24 272531374722091

List of values

[0, 1, 6, 28, 121, 511, 2152, 9094, 38563, 163729, 694282, 2934592, 12348541, 51697075, 215291356, 891989002, 3677964295, 15099277669, 61745907934, 251632677604, 1022414950465, 4143511249831, 16755357788176, 67628131638478, 272531374722091]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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