82500

Appears in sequences

• Partial sums of Catalan numbers (A000108).at n=11A014137
• Position of A075165(n+1) in A014486.at n=36A075161
• Triangle read by rows: T(n,k) is number of Dyck paths of semilength n and having leftmost valley at altitude k (if path has no valleys, then this altitude is considered to be 0).at n=57A097607
• Bisection of A014137.at n=5A099975
• Triangle read by rows: number of Dyck paths of semilength n with k peaks before the first return (1<= k <n).at n=56A101974
• Position of A106455(n+1) in A014486.at n=54A106451
• a(n) = Sum_{k=0..floor(n/2)} Catalan(k).at n=22A110199
• a(n) = Sum_{k=0..floor(n/2)} Catalan(k).at n=23A110199
• Fixed points of the permutation A125987/A125988.at n=36A126298
• Numbers k such that k and k^2 use only the digits 0, 2, 5, 6 and 8.at n=44A136913
• a(n) = 2662*n - 22.at n=30A157609
• a(n) = n^4*(n-1)*(n+1)/12.at n=9A208954
• Triangle where the g.f. of row n is: Sum_{k=0..n^2-n+1} T(n,k)*y^k = (2*(1+y)^n - 1) * ((1+y)^n - 1)^(n-1) / y^(n-1), as read by rows.at n=30A220265
• Triangle read by rows: T(n,k) = T(n,k-1) + T(n-1,k), T(n,0)=1, T(n,n) = T(n,n-1) + 1.at n=77A283054
• Number x = concat(MSD(x),b) such that MSD(x)*b = phi(x), where MSD(x) is the Most Significant Digit of x and phi(x) is the Euler totient function of x.at n=35A286130
• Numbers m such that the largest digit in the decimal expansion of 1/m is 2.at n=26A341383