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.

A116411 Coefficient of x^n in the expansion of (1+x+x^3)^n.

Table of values

n a(n)
0 1
1 1
2 1
3 4
4 13
5 31
6 76
7 211
8 589
9 1597
10 4351
11 12046
12 33496
13 93094
14 259351
15 725089
16 2031709
17 5701189
18 16023181
19 45104044
20 127134283
21 358764613
22 1013494318
23 2865933907
24 8111573416
25 22977551656
26 65138143006
27 184789086106
28 524571000799
29 1490044262503
30 4234901256781
31 12042611698876
32 34262320521661
33 97525522430989

List of values

[1, 1, 1, 4, 13, 31, 76, 211, 589, 1597, 4351, 12046, 33496, 93094, 259351, 725089, 2031709, 5701189, 16023181, 45104044, 127134283, 358764613, 1013494318, 2865933907, 8111573416, 22977551656, 65138143006, 184789086106, 524571000799, 1490044262503, 4234901256781, 12042611698876, 34262320521661, 97525522430989]

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

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