Total number of 123 patterns in all heapable permutations of length n.
A391286
Total number of 123 patterns in all heapable permutations of length n.
Terms
- a(0) =0a(1) =0a(2) =1a(3) =10a(4) =78a(5) =614a(6) =5136a(7) =46426a(8) =455357a(9) =4841006a(10) =55626686a(11) =688388890a(12) =9140416176a(13) =129745372766
External references
- oeis: A391286