31182

Appears in sequences

• Numbers whose natural logarithm, in base 10, starts with 10 distinct digits.at n=10A113509
• Triangle read by rows: T(n,k) is the number of alternating (i.e., down-up) permutations of {1,2,...,n} having k fixed points (n >= 0, 0 <= k <= ceiling(n/2)).at n=52A162979
• a(n) = A000041(n) - A032741(n).at n=39A167934
• Sum of pyramid weights of all dispersed Dyck paths of length n (i.e., of all Motzkin paths of length n with no (1,0) steps at positive heights).at n=15A191319
• Coefficient of x in the reduction by x^2 -> x+1 of the polynomial p(n,x) defined at Comments.at n=18A192951