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.

A036216 Expansion of 1/(1 - 3*x)^4; 4-fold convolution of A000244 (powers of 3).

Table of values

n a(n)
0 1
1 12
2 90
3 540
4 2835
5 13608
6 61236
7 262440
8 1082565
9 4330260
10 16888014
11 64481508
12 241805655
13 892820880
14 3252418920
15 11708708112
16 41712272649
17 147219785820
18 515269250370
19 1789882659180
20 6175095174171
21 21171754882872

List of values

[1, 12, 90, 540, 2835, 13608, 61236, 262440, 1082565, 4330260, 16888014, 64481508, 241805655, 892820880, 3252418920, 11708708112, 41712272649, 147219785820, 515269250370, 1789882659180, 6175095174171, 21171754882872]

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

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