63468

Appears in sequences

• Define an array by d(m, 0) = 1, d(m, 1) = m; d(m, k) = (m - k + 1) d(m+1, k-1) - (k-1) (m+1) d(m+2, k-2). Sequence gives d(n,3).at n=41A126935
• a(n) = 49*n^2 - n.at n=35A157923
• a(n) = 196*n^2 - 2*n.at n=17A158224
• a(n) = 1296*n^2 - 36.at n=6A158737
• Number x such that usigma(x) = (-1)sigma(x), where usigma(x) is the sum of unitary divisors of x (A034448) and (-1)sigma(x) is defined in A049060 .at n=5A258101
• Positive integers k such that the decimal representation of 2^k ends with some permutation of the string "0123456789".at n=21A347164
• Number of transitive relations on an n-set with exactly five ordered pairs.at n=6A348634