23972

Appears in sequences

• a(n) = [ a(n-1)/a(1) + a(n-3)/a(3) + a(n-5)/a(5) + ... ], for n >= 3.at n=40A022871
• To obtain a(n+1), take the square of the n-th partial sum, minus the sum of the first n squared terms, then divide this difference by a(n); for all n>1, starting with a(0)=1, a(1)=1.at n=14A087640
• Number of binary rooted trees with n nodes and internal path length n.at n=47A108643
• McKay-Thompson series of class 24E for the Monster group.at n=29A112160
• Number of intersection points outside the n-gon of all lines through pairs of vertices of a regular n-gon.at n=23A146213
• Numbers that are the sum of eight fourth powers in exactly nine ways.at n=32A345841