Number of s in {1,...,n}^n having shortest run with the same value of length 2.
A228621
Number of s in {1,...,n}^n having shortest run with the same value of length 2.
Terms
- a(0) =2a(1) =0a(2) =12a(3) =40a(4) =210a(5) =840a(6) =5208a(7) =23760a(8) =148410a(9) =786720a(10) =5137440a(11) =30051528a(12) =207058488a(13) =1318599240a(14) =9540828480a(15) =65319695136a(16) =495194683680
External references
- oeis: A228621