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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.

A151637 Number of permutations of 3 indistinguishable copies of 1..n with exactly 7 adjacent element pairs in decreasing order.

Table of values

n a(n)
1 0
2 0
3 0
4 6750
5 40241088
6 40396577931
7 18096792917796
8 5183615502649800
9 1129236431002624116
10 205937718403143468690
11 33309411205799991188160
12 4957409194925592040479126
13 695659299332984273417824080
14 93590807522941640152432361025
15 12213007949715545409829962783732

List of values

[0, 0, 0, 6750, 40241088, 40396577931, 18096792917796, 5183615502649800, 1129236431002624116, 205937718403143468690, 33309411205799991188160, 4957409194925592040479126, 695659299332984273417824080, 93590807522941640152432361025, 12213007949715545409829962783732]

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

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