20316160

Appears in sequences

• Expansion of (1+2*x) / (1-2*x)^4.at n=14A014483
• a(n) = 2^(n-2)*(n^2 - n + 4).at n=18A053730
• Number of perfect matchings in variant of n X n+2 Aztec rectangle graph.at n=4A071103
• Sums of the squares of the elements in the subsets of the integers 1 to n.at n=15A087076
• E.g.f.: x/[1-tan(x)].at n=10A109572
• a(n) is the least number having sum of digits n in base 10 and also exactly n prime factors (counted with multiplicity).at n=17A113758