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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.

A294035 a(n) = 3^n*hypergeom([-n/3, (1-n)/3, (2-n)/3], [1, 1], -1).

Table of values

n a(n)
0 1
1 3
2 9
3 33
4 153
5 783
6 4059
7 21087
8 110889
9 592899
10 3214989
11 17608077
12 97150491
13 539331237
14 3010588317
15 16887545793
16 95134584969
17 537942476907
18 3051902823849
19 17365639042449
20 99076018204413
21 566622950463099
22 3247670747106927
23 18651711493531539
24 107315246617831179

List of values

[1, 3, 9, 33, 153, 783, 4059, 21087, 110889, 592899, 3214989, 17608077, 97150491, 539331237, 3010588317, 16887545793, 95134584969, 537942476907, 3051902823849, 17365639042449, 99076018204413, 566622950463099, 3247670747106927, 18651711493531539, 107315246617831179]

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

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