43860

Appears in sequences

• Triangle T(n,k) of number of unilaterally connected digraphs on n unlabeled nodes with k arcs, k=0..n*(n-1).at n=65A057270
• Triangle T(n,k) of number of digraphs with a source and a sink on n unlabeled nodes and k arcs, k=0..n*(n-1).at n=65A057278
• Total sum of odd parts in all partitions of n.at n=26A066967
• a(n) is the smallest number m such that m has n distinct prime divisors and if p is a prime divisor of m then p*m +1 is prime.at n=4A092024
• Counts 2-wild partitions. In general p-wild partitions of n are defined so that they are in bijection with geometric equivalence classes of degree n algebra extensions of the p-adic field Q_p. Here two algebra extensions are equivalent if they become isomorphic after tensoring with the maximal unramified extension of Q_p.at n=12A131139
• Numerator of Bernoulli(n,9).at n=5A158063
• Magic sums of 4 X 4 magic squares composed of odd squares.at n=21A271582