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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.

A192440 Coefficient of x^floor(n/2) in the expansion of (1+x+x^3)^n.

Table of values

n a(n)
0 1
1 1
2 2
3 3
4 6
5 10
6 26
7 42
8 126
9 198
10 612
11 957
12 2970
13 4654
14 14534
15 22815
16 71838
17 112846
18 357884
19 562343
20 1793296
21 2818536
22 9026976
23 14191575
24 45612450
25 71726650
26 231224060
27 363685545
28 1175422590
29 1849145850
30 5989693176
31 9424458831
32 30586693182
33 48133936158
34 156483812892

List of values

[1, 1, 2, 3, 6, 10, 26, 42, 126, 198, 612, 957, 2970, 4654, 14534, 22815, 71838, 112846, 357884, 562343, 1793296, 2818536, 9026976, 14191575, 45612450, 71726650, 231224060, 363685545, 1175422590, 1849145850, 5989693176, 9424458831, 30586693182, 48133936158, 156483812892]

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

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