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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.

A073748 a(n) = S(n)*S(n-1), where S(n) are the generalized tribonacci numbers A001644.

Table of values

n a(n)
0 -3
1 3
2 3
3 21
4 77
5 231
6 819
7 2769
8 9301
9 31571
10 106763
11 361045
12 1221685
13 4132743
14 13980747
15 47297217
16 160004685
17 541291715
18 1831178355
19 6194830005
20 20956959933
21 70896891079
22 239842458947
23 811381229009
24 2744883043045
25 9285872805715
26 31413882695739
27 106272403946805

List of values

[-3, 3, 3, 21, 77, 231, 819, 2769, 9301, 31571, 106763, 361045, 1221685, 4132743, 13980747, 47297217, 160004685, 541291715, 1831178355, 6194830005, 20956959933, 70896891079, 239842458947, 811381229009, 2744883043045, 9285872805715, 31413882695739, 106272403946805]

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

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