26956

Appears in sequences

• G.f.: Product_{k>=1} (1 - x^k)^(-k^7).at n=4A023876
• a(n) is the number of different graphs drawn in the following way: you decide for each number k <= n on a pair of positive numbers (x(k),y(k)) such that x(k)+y(k)=k; you draw n points numbered 1 to n; draw two arrows from n, one to x(n) and one to y(n); draw two arrows from each k already reached by an arrow, one to x(k) and one to y(k). The process stops when 1 is the only point reached by an arrow without any arrow leaving it; you can also erase the isolated points.at n=17A058050
• Numbers k such that k and 5*k, taken together, are pandigital.at n=18A115925
• Antidiagonal sums of table A162424.at n=12A162428
• Row n=4 of A144048.at n=7A283456
• Numbers that are divisible by the total number of 1's in both the Zeckendorf and the dual Zeckendorf representations of all their divisors (A300837 and A333618).at n=15A333621