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.

A036220 Expansion of 1/(1-3*x)^7; 7-fold convolution of A000244 (powers of 3).

Table of values

n a(n)
0 1
1 21
2 252
3 2268
4 17010
5 112266
6 673596
7 3752892
8 19702683
9 98513415
10 472864392
11 2192371272
12 9865670724
13 43257171636
14 185387878440
15 778629089448
16 3211844993973
17 13036312034361
18 52145248137444
19 205836505805700
20 802762372642230
21 3096369151620030

List of values

[1, 21, 252, 2268, 17010, 112266, 673596, 3752892, 19702683, 98513415, 472864392, 2192371272, 9865670724, 43257171636, 185387878440, 778629089448, 3211844993973, 13036312034361, 52145248137444, 205836505805700, 802762372642230, 3096369151620030]

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

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