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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.

A006217 Number of down-up permutations of n+5 starting with 5.

Table of values

n a(n)
0 5
1 16
2 56
3 224
4 1024
5 5296
6 30656
7 196544
8 1383424
9 10608976
10 88057856
11 786632864
12 7525556224
13 76768604656
14 831846342656
15 9541952653184
16 115516079079424
17 1471865234248336
18 19689636672045056
19 275914012819601504

List of values

[5, 16, 56, 224, 1024, 5296, 30656, 196544, 1383424, 10608976, 88057856, 786632864, 7525556224, 76768604656, 831846342656, 9541952653184, 115516079079424, 1471865234248336, 19689636672045056, 275914012819601504]

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

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