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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.

A264323 Number of permutations of [n] with exactly four (possibly overlapping) occurrences of the consecutive pattern 3412.

Table of values

n a(n)
10 1
11 89
12 5461
13 238356
14 8368831
15 259770975
16 7542478135
17 211794493290
18 5870838954710
19 162745118970610
20 4549825111681964
21 128994813976541176
22 3722621639161251074
23 109622707753571938234
24 3299453321046315967098
25 101610430484526744949716
26 3203896974449174366163207

List of values

[1, 89, 5461, 238356, 8368831, 259770975, 7542478135, 211794493290, 5870838954710, 162745118970610, 4549825111681964, 128994813976541176, 3722621639161251074, 109622707753571938234, 3299453321046315967098, 101610430484526744949716, 3203896974449174366163207]

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

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