Sum of indices of the positions of 2 in all heapable permutations of length n (positions starting from 0).
A390450
Sum of indices of the positions of 2 in all heapable permutations of length n (positions starting from 0).
Terms
- a(0) =0a(1) =1a(2) =3a(3) =9a(4) =35a(5) =162a(6) =891a(7) =5664a(8) =41061a(9) =334675a(10) =3034176a(11) =30311763a(12) =331074965a(13) =3926884061a(14) =50284845273a(15) =691632150641
External references
- oeis: A390450