49841

Appears in sequences

• a(n) = 9*a(n-1) - a(n-2) for n > 0, a(0)=1, a(-1)=1.at n=5A070998
• Number of (w,x,y,z) with all terms in {1,...,n} and w<2x+y+z.at n=15A212145
• 30-gonal pyramidal numbers: a(n) = n*(n+1)*(28*n-25)/6.at n=22A256650
• Maximal intervals of balanced binary trees in the Tamari lattices.at n=27A272372
• Heinz numbers of integer partitions into relatively prime parts whose reciprocal sum is the reciprocal of an integer.at n=18A316901
• Numbers m such that sigma(m) / tau(m) = sigma(m - 1) / tau(m - 1) + sigma(m + 1) / tau(m + 1).at n=2A347077