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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.

A015461 q-Fibonacci numbers for q=4, scaling a(n-2).

Table of values

n a(n)
0 0
1 1
2 1
3 5
4 21
5 341
6 5717
7 354901
8 23771733
9 5838469717
10 1563742763605
11 1532083548256853
12 1641235215638133333
13 6427665390003549698645
14 27541785384957544314239573
15 431380864280640133787922528853

List of values

[0, 1, 1, 5, 21, 341, 5717, 354901, 23771733, 5838469717, 1563742763605, 1532083548256853, 1641235215638133333, 6427665390003549698645, 27541785384957544314239573, 431380864280640133787922528853]

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

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