A064050 - cp's OEIS frontend

A064050 Number of essentially different (not mappable to each other by reflection or rotation) arrangements of numbers 1 to n*(n+1)/2 in a triangle of n rows, in such a way that each row and each diagonal is increasing or decreasing.

n	a(n)
1	1
2	1
3	4
4	30
5	702
6	76844
7	50448952
8	230643876376
9	8267423666602776
10	2588783179055230532664
11	7821803477915366921777312696
12	249798463487076698389715808536913464
13	91691177557134991595405594421320691579192632
14	417955522215118460342460602239817237893422169776951160

[1, 1, 4, 30, 702, 76844, 50448952, 230643876376, 8267423666602776, 2588783179055230532664, 7821803477915366921777312696, 249798463487076698389715808536913464, 91691177557134991595405594421320691579192632, 417955522215118460342460602239817237893422169776951160]

cp's OEIS Frontend

A064050 Number of essentially different (not mappable to each other by reflection or rotation) arrangements of numbers 1 to n*(n+1)/2 in a triangle of n rows, in such a way that each row and each diagonal is increasing or decreasing.

Table of values

List of values