162261

Appears in sequences

• Number of ordered rooted trees with n edges such that the rightmost leaf of each subtree is at even level. Equivalently, number of Dyck paths of semilength n with no return descents of odd length.at n=11A033297
• Largest palindromic substring in 3^n.at n=19A046261
• Number of 3 X 3 symmetric matrices over Z(n) having determinant 0.at n=10A115223
• a(0)=1, a(1)=1, a(n) = 11*a(n/2) for even n, and a(n) = 10*a((n-1)/2) + a((n+1)/2) for odd n >= 3.at n=36A116525
• a(n) = n^5 + n^3 - n^2.at n=11A133072
• p^5 + p^3 - p^2. Exponents are the prime numbers in decreasing order and p is the n-th prime.at n=4A135181
• Numbers k such that k and k^2 use only the digits 1, 2, 3, 6 and 8.at n=8A136980
• a(0)=1; a(n) = Sum_{k=1..n-1} d(k)*a(n-k), where d(m) is m-th bit in binary expansion of n.at n=28A260956
• Palindromic numbers such that the sum of the digits equals the number of divisors.at n=32A263720
• Number of (n + 1, n + 2)-core partitions with odd parts and corresponding order ideals confined to the two outermost diagonals of P_{n + 1, n + 2}.at n=18A299099