40043

Appears in sequences

• Number of 2-factors in P_4 X P_n.at n=9A003693
• Number of rooted connected unlabeled planar graphs on n nodes.at n=7A126201
• Write 1 + sin x = Product_{n>=1} (1 + g_n * x^n); a(n) = numerator(g_n).at n=9A170914
• Array read by upwards antidiagonals: T(m,n) = number of set partitions into distinct parts of the multiset consisting of one copy each of x_1, x_2, ..., x_m, and two copies each of y_1, y_2, ..., y_n, for m >= 0, n >= 0.at n=26A322770
• Row 1 of array in A322770.at n=5A322771
• Number of partitions of the (n+5)-multiset {1,2,...,n,1,2,...,5} into distinct multisets.at n=6A346898
• Number of partitions of the (n+6)-multiset {1,2,...,n,1,2,...,6} into distinct multisets.at n=5A346899