A300159 - cp's OEIS frontend

A300159 Number of ways of converting one set of lists containing n elements to another set of lists containing n elements by removing the last element from one of the lists and either appending it to an existing list or treating it as a new list.

n	a(n)
0	0
1	0
2	4
3	30
4	240
5	2140
6	21300
7	235074
8	2853760
9	37819800
10	543445380
11	8416452550
12	139753069104
13	2476581106740
14	46648575724660
15	930581784937770
16	19597766647728000
17	434455097953799344
18	10112163333554834820
19	246539064280189932270
20	6282671083849941925360

[0, 0, 4, 30, 240, 2140, 21300, 235074, 2853760, 37819800, 543445380, 8416452550, 139753069104, 2476581106740, 46648575724660, 930581784937770, 19597766647728000, 434455097953799344, 10112163333554834820, 246539064280189932270, 6282671083849941925360]

cp's OEIS Frontend

A300159 Number of ways of converting one set of lists containing n elements to another set of lists containing n elements by removing the last element from one of the lists and either appending it to an existing list or treating it as a new list.

Table of values

List of values