On the number of single-peaked narcissistic or single-crossing narcissistic preference profiles

We investigate preference profiles for a set V of voters, where each voter i has a preference order ≻_i on a finite set A of alternatives (that is, a linear order on A) such that for each two alternatives a,b∈A, voter i prefers a to b if a≻_ib. Such a profile is narcissistic if each alternative a is preferred the most by at least one voter. It is single-peaked if there is a linear order ▹^sp on the alternatives such that each voter's preferences on the alternatives along the order ▹^sp are either strictly increasing, or strictly decreasing, or first strictly increasing and then strictly decreasing. It is single-crossing if there is a linear order ▹^sc on the voters such that each pair of alternatives divides the order ▹^sc into at most two suborders, where in each suborder, all voters have the same linear order on this pair. We show that for n voters and n alternatives, the number of single-peaked narcissistic profiles is ∏_i=2ⁿ⁻¹[Formula presented] while the number of single-crossing narcissistic profiles is 2^{[Formula presented]}.