cp's OEIS Frontend

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.

A177527 Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, up, up.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 24
5 120
6 694
7 4676
8 35952
9 310464
10 2984176
11 31536583
12 363591384
13 4541789148
14 61089594448
15 880428095803
16 13534614549829
17 221066397540186
18 3823205871530350
19 69792946997645295
20 1341134146478847104
21 27059669661295560098
22 571973335506443017436

List of values

[1, 1, 2, 6, 24, 120, 694, 4676, 35952, 310464, 2984176, 31536583, 363591384, 4541789148, 61089594448, 880428095803, 13534614549829, 221066397540186, 3823205871530350, 69792946997645295, 1341134146478847104, 27059669661295560098, 571973335506443017436]

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

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