124848

Appears in sequences

• a(n) = n*(n+1)^2*(n+2)^2/12.at n=16A004282
• a(n) = floor(n/2) * floor((n-1)/2) * floor((n-2)/2) * floor((n-3)/2) * floor((n-4)/2) / 12.at n=37A028725
• Non-perfect powers k for which q = A051903(k)/A051904(k) is an integer, A051904(k) > 1.at n=18A093770
• Numbers with prime factorization p^2*q^3*r^4 where p, q, and r are distinct primes.at n=15A190115
• Numbers n such that there exists an m so that squarefree kernel of n = squarefree kernel of m, and n is the sum of the proper divisors of m (m may equal n).at n=26A252234
• Coefficients in expansion of Eisenstein series -q*(d/dq)(q*(d/dq)E_2).at n=17A282154
• a(n) appears in the congruences modulo 4 or 32 of Markoff numbers m(n) = A002559(n) for odd or even m(n).at n=36A309376
• a(n) is the number of subsets of {1..n} that contain exactly 2 odd and 3 even numbers.at n=36A330300
• Irregular triangular array T; row n shows the coefficients of the (n-1)-st polynomial in the obverse convolution s(x)**t(x), where s(x) = x+1 and t(x) = F(n) = n-th Fibonacci number. See Comments.at n=37A375047