A064382 - cp's OEIS frontend

A064382 Number of ways to put numbers 1, 2, ..., n*(n+1)/2 in a triangular array of n rows in such a way that each row is increasing or decreasing.

n	a(n)
1	1
2	6
3	240
4	100800
5	605404800
6	65703372134400
7	155590841484029952000
8	9416463528385701835407360000
9	16689045681854870055279680279347200000
10	976264092939656812770160178186221444104192000000
11	2097176933095579995533106263090939623313258344938995712000000

[1, 6, 240, 100800, 605404800, 65703372134400, 155590841484029952000, 9416463528385701835407360000, 16689045681854870055279680279347200000, 976264092939656812770160178186221444104192000000, 2097176933095579995533106263090939623313258344938995712000000]

cp's OEIS Frontend

A064382 Number of ways to put numbers 1, 2, ..., n*(n+1)/2 in a triangular array of n rows in such a way that each row is increasing or decreasing.

Table of values

List of values