214955

Appears in sequences

• Number of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums.at n=9A258830
• Number of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value <= 9.at n=9A262171
• Number of permutations p of [n] such that the up-down signature of 0,p has nonnegative partial sums with a maximal value <= 10.at n=9A262172
• a(n) is the smallest number which can be represented as the sum of n distinct nonzero n-gonal numbers in exactly n ways, or 0 if no such number exists.at n=30A350405