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.

A269042 Number of permutations of [2n] avoiding the pattern 12...n.

Table of values

n a(n)
0 0
1 0
2 1
3 132
4 15767
5 2190688
6 370531683
7 77182248916
8 19835792076675
9 6266271456118776
10 2413632612087046844
11 1120958514818713738544
12 619918692943471064695593
13 403190647991638511052901232
14 304867528413299672718870216538
15 265248225675908889875489731636920

List of values

[0, 0, 1, 132, 15767, 2190688, 370531683, 77182248916, 19835792076675, 6266271456118776, 2413632612087046844, 1120958514818713738544, 619918692943471064695593, 403190647991638511052901232, 304867528413299672718870216538, 265248225675908889875489731636920]

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

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