357120

Appears in sequences

• Number of connected labeled 2-regular digraphs with n nodes.at n=7A007108
• a(n) = 2^(n-4)*n*(n+1)*(n^2+5*n-2).at n=9A058649
• The sum of the two numbers in an amicable pair, A002025(n) + A002046(n).at n=19A180164
• Triangle T(n,k) = coefficient of x^n/n! in expansion of (x/cos x)^k/k!.at n=46A188832
• The sum (in nondecreasing order) of the two numbers in an amicable pair.at n=19A259953
• Expansion of 2*x^6*(4-10*x+7*x^2)/(1-2*x)^5.at n=14A268599
• Numbers k = concat(s,t) such that k = (Fibonacci(s) mod k) * (Fibonacci(t) mod k).at n=30A272770
• The number of positive integer sequences of length n with no duplicate substrings of length greater than 1, every number different from its neighbors, and a minimal sum (= A282166(n)).at n=17A284431
• Irregular triangular array read by rows. T(n,k) is the number of direct sum decompositions V_1 + V_2 + ... + V_m = GF(2)^n with the dimensions of the V_i corresponding to the k-th partition of n in canonical ordering, n >= 0, 1 <= k <= A000041(n).at n=23A358165