33883

Appears in sequences

• Decimal part of n-th root of a(n) starts with digit 4.at n=29A034081
• Number of ternary rooted trees with n nodes and height at most 5.at n=19A036373
• Expansion of (1/(1-x^2))*c(x/(1-x^2)), where c(x) is the g.f. of A000108.at n=10A105864
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 1), (0, 1, 1), (1, 1, -1)}.at n=9A149008
• Total number of even parts in the last section of the set of partitions of n.at n=40A206434
• a(n) = (2^n - 1) * (3^(n+2) - 1) / 2.at n=5A253512
• Numbers k such that card({x|sigma(x)=k}) > 1 and (Sum_{sigma(x)=k} x) < k.at n=37A258931
• Numbers with digits 3 and 8 only.at n=36A284963
• Triangle read by rows: T(n,k) (0 <= k <= n) is the rank of the ideal I_r in the inverse semigroup D_n of all difunctional relations on an n-element set.at n=50A294432
• Odd numbers m such that sigma(x) = m has more than 1 solution.at n=15A300869
• Numbers k such that k^2 | A038199(k).at n=40A317475
• Number of uniform rooted trees with n nodes.at n=14A317712
• a(n) = sigma(A003961(n^2)), where A003961 is fully multiplicative with a(prime(i)) = prime(i+1), and sigma is the sum of divisors function.at n=23A379482