32620

Appears in sequences

• Number of permutations of 0..n-1 with all sums of 2 through 3 adjacent terms squared respectively unique.at n=7A147732
• Number of distinct solutions of sum{i=1..4}(x(2i-1)*x(2i)) = 1 (mod n), with x() only in 2..n-2.at n=12A180827
• Expansion of (2-17*x)/((1-4*x)*(1-6*x)*(1-8*x)*(1-10*x)*(1-16*x)).at n=3A221959
• Members of a pair (m,k) such that sigma(m) = sigma(k) = sigma(m+k), m < k where sigma = A000203.at n=14A239436
• Members of a pair (m,n) such that sigma(m) = sigma(n) = sigma(n-m), m < n where sigma = A000203.at n=28A239939
• a(n) = 2*a(n-1) + a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.at n=13A298412
• a(n) is the smallest number which can be represented as the sum of n distinct centered n-gonal numbers in exactly n ways, or -1 if no such number exists.at n=17A352975