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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.

A293950 Number of linear extensions of a poset whose Hasse diagram consists of n binary shrubs with type A_n joins.

Table of values

n a(n)
0 1
1 2
2 40
3 3194
4 666160
5 287316122
6 222237912664
7 280180369563194
8 537546603651987424
9 1490424231594917313242
10 5735930050702709579598280
11 29665120602262869704075225594
12 200776204583497637546703088929040
13 1739317344037357729592558320480494362

List of values

[1, 2, 40, 3194, 666160, 287316122, 222237912664, 280180369563194, 537546603651987424, 1490424231594917313242, 5735930050702709579598280, 29665120602262869704075225594, 200776204583497637546703088929040, 1739317344037357729592558320480494362]

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

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