18730

Appears in sequences

• Number of two-rowed partitions of length 3.at n=43A001993
• Number of ordered quadruples of integers from [ 1..n ] with no global factor.at n=24A015634
• Operation count to create all permutations of n distinct elements using the "streamlined" version of Algorithm L (lexicographic permutation generation) from Knuth's The Art of Computer Programming, Vol. 4, chapter 7.2.1.2. Sequence gives number of cases where the j search loop runs beyond j=n-3.at n=6A079751
• Second edge diagonal of table A176577. (The first edge diagonal is A099627).at n=40A176575
• Partial sums of A253090.at n=37A255603
• G.f. A(x) satisfies: A(x) = (1 + x) * A(x^2)^2*A(x^3)^3*A(x^4)^4* ... *A(x^k)^k* ...at n=16A307605
• Triangle read by rows: T(n,k) = Sum_{j=0..k} binomial(n,j) * j! (0 <= k <= n).at n=50A347667