70740

Appears in sequences

• Number of paths on square lattice.at n=10A006191
• Triangle read by rows: T(n,k) is the number of labeled commutative monoids of order n with k idempotents.at n=18A058159
• Numbers such that the digital sum base 2 and the digital sum base 3 and the digital sum base 4 all are equal.at n=10A135122
• Exponential (2,4)-perfect numbers: numbers m such that esigma(esigma(m)) = 4m, where esigma(m) is the sum of exponential divisors of m (A051377).at n=32A328133
• a(n) = (n^3+5*n+3)/3 + 2*floor(n/2) + a(n-2), with a(0)=1 and a(1)=3.at n=35A336529
• Triangle read by rows T(n, k) is the number of permutations on n elements whose square has k descents, for n >= 1 and 0 <= k <= n-1.at n=41A373691