21261

Appears in sequences

• Base-8 palindromes that start with 5.at n=30A043025
• One seventh of the sum of the first n primes, when an integer.at n=32A112272
• a(n) = 2*n^3 - 2*n + 9.at n=21A127989
• Number of (w,x,y) with all terms in {0,...,n} and w<x+y and x<=y.at n=36A212982
• Number of nX3 0..1 arrays with no more than floor(nX3/2) elements unequal to at least one king-move neighbor, with new values introduced in row major 0..1 order.at n=9A222355
• G.f. A(x) satisfies: 0 = Sum_{n=-oo..+oo} x^(n*(n-1)/2) * (x^n - A(x))^n.at n=9A355861