How many n digit numbers you can write by using only 1's and 2's and you are allowed to use neither two consecutive 1's nor three consecutive 2's?

2,3,4,5,7,9,12,16,21,28,37,49,65,86,114,151,200,265,351,465

Edited on July 7, 2024, 10:40 am

Posted by K Sengupta on 2024-07-07 10:40:07