19086

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 92.at n=28A031590
• Triangle: a(n,m) = number of permutations of (1,2,...,n) with one or more fixed points in the m first positions.at n=32A061018
• Number of + signs needed to write the partitions of n (A000041) as sums.at n=26A076276
• A triangle related to the GF(z) formulas of the rows of the ED4 array A167584.at n=26A167594
• Number T(n,k) of occurrences of k in a (signed) displacement set of a permutation of [n]; triangle T(n,k), n>=1, 1-n<=k<=n-1, read by rows.at n=53A306461
• Number T(n,k) of occurrences of k in a (signed) displacement set of a permutation of [n]; triangle T(n,k), n>=1, 1-n<=k<=n-1, read by rows.at n=59A306461
• G.f. A(x) satisfies: Sum_{n>=0} A(x)^(n*(n+1)/2) * x^n = Sum_{n>=0} (1+x)^(n*(n-1)/2) * x^n.at n=11A326424
• Maximal coefficient of (1 + x) * (1 + x^3) * (1 + x^6) * ... * (1 + x^(n*(n+1)/2)).at n=24A359348
• Orders of Origami monoid on n strings constructed from the Jones monoid on n strings.at n=4A380196