269001

Appears in sequences

• Odd pentagonal pyramidal numbers.at n=20A015223
• a(n) = n^4*(n^2 + 1)/2.at n=9A168192
• a(n) = n^8*(n^4 + 1)/2.at n=3A170776
• Number of (w,x,y,z) with all terms in {1,...,n} and w>=average{x,y,z}.at n=27A212089
• a(n) = (8*n + 1)^2*(4*n + 1).at n=10A387684