47531

Appears in sequences

• a(n) = 2*binomial(n+4, 4) + n + 4.at n=25A177206
• G.f.: x/sqrt(1 + x^2 - 2*x*sqrt(1 + 4*x^2)).at n=16A201645
• Principal diagonal of the convolution array A213771.at n=28A213772
• Sum of the next to smallest parts in the partitions of 4n into 4 parts with smallest part = 1.at n=42A239195
• Centered 10-gonal numbers which are sphenic numbers.at n=3A368426