18579

Appears in sequences

• Triangle arising from solution to a*x = tan x (next row contains non-integral entries).at n=16A059368
• Floor(|x*sin(x)|)-perfect numbers, where f-perfect numbers for an arithmetical function f are defined in A066218.at n=10A066245
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n and height k (1 <= k <= n).at n=58A080936
• a(n) = 9 + floor((3 + Sum_{j=1..n-1} a(j))/4).at n=34A120167
• Expansion of o.g.f. (1-x^2+x^4)/((1-x)^2*(1-x^2)^4*(1-x^3)^4).at n=18A123991
• Number of binary strings of length n with no substrings equal to 0001, 1010, or 1100.at n=23A164487
• Number of isomorphism classes of connected 3-regular loopless multigraphs with n vertices and with semi-edges allowed.at n=10A243391
• Number of isomorphism classes of connected 3-regular simple graphs of order 2n with loops and semi-edges allowed.at n=10A243392
• a(n) = max{T(n,k), k=1..n}, where T(n,k) is the number of Dyck paths of length 2n and height k (1<=k<=n).at n=10A259885
• Number of Dyck paths of semilength n and height exactly 4.at n=11A262600
• Number of unlabeled connected loopless multigraphs with n nodes of degree 3 or less and with single or double edges.at n=11A303030
• Irregular table read by rows, T(n, k) is the rank of the k-th Seidel permutation of {1,...,n}, permutations sorted in lexicographical order.at n=33A347600
• Expansion of (1/x) * Series_Reversion( x / (1 + x^3 / (1 - x)^4) ).at n=12A389251