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.

A264321 Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive pattern 3412.

Table of values

n a(n)
6 1
7 23
8 379
9 5706
10 84354
11 1266150
12 19621124
13 316459848
14 5331647951
15 93959680785
16 1732274350449
17 33392773007922
18 672442070185276
19 14130089667648160
20 309458726679280550
21 7054945428667834408
22 167218369471952249237
23 4115763361988379577315
24 105071634182596234984655

List of values

[1, 23, 379, 5706, 84354, 1266150, 19621124, 316459848, 5331647951, 93959680785, 1732274350449, 33392773007922, 672442070185276, 14130089667648160, 309458726679280550, 7054945428667834408, 167218369471952249237, 4115763361988379577315, 105071634182596234984655]

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

Content is available under The OEIS End-User License Agreement.