A383255 Number of n X n {0,1,2,3} matrices having no 1's to the right of any 0's and no 3's above any 2's.
1, 4, 194, 107080, 672498596, 48104236145168, 39202958861329453384, 364022757339778569993689888, 38513979937284562006371342202842000, 46429021191757554279412904483559912259714112, 637737721080296383894709847744103523361428384973270816
Offset: 0
Keywords
Examples
The 3 X 3 matrices below are counted under a(3) = 107080: [0,0,0] [1,0,2] [2,3,2] [0,0,0] [1,0,3] [3,3,3] [0,0,0],[0,2,3],[3,3,3].
Links
- John Tyler Rascoe, Python program.
Programs
-
Python
# see links
Formula
a(n) <= A060757(n).
Extensions
a(5)-a(10) from Bert Dobbelaere, Apr 23 2025
Comments