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.

A151646 Number of permutations of 4 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 0
3 1
4 4961755
5 93200908410
6 342907451401150
7 580563155365559991
8 636819836268006188325
9 536414785137072299859000
10 381545916738691833553696960
11 242640958318176281706165559005
12 143034343946525950106468425526767
13 80029528286823033581035280235294534

List of values

[0, 0, 1, 4961755, 93200908410, 342907451401150, 580563155365559991, 636819836268006188325, 536414785137072299859000, 381545916738691833553696960, 242640958318176281706165559005, 143034343946525950106468425526767, 80029528286823033581035280235294534]

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

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