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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.

A177473 Number of permutations of order n avoiding the consecutive pattern 12'1'2.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 18
5 61
6 272
7 1410
8 8048
9 51550
10 372995
11 2976679
12 25686748
13 239687103
14 2419267562
15 26194183096
16 301838412516
17 3692782460824
18 47891164866100
19 655887513203263
20 9449915113835659
21 142923476094740969
22 2265214890150056647
23 37539217881003574022
24 649054317768293760078

List of values

[1, 1, 2, 6, 18, 61, 272, 1410, 8048, 51550, 372995, 2976679, 25686748, 239687103, 2419267562, 26194183096, 301838412516, 3692782460824, 47891164866100, 655887513203263, 9449915113835659, 142923476094740969, 2265214890150056647, 37539217881003574022, 649054317768293760078]

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

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