21549

Appears in sequences

• Number of base 9 circular n-digit numbers with adjacent digits differing by 1 or less.at n=9A124702
• a(n) = ceiling(Pi*n^3).at n=19A247194
• Greatest integer whose square root is less than or equal to Sum_{j=0..n} sqrt(j).at n=36A338277
• T(n, k) = Sum_{j=1..k} (1 + 2*cos(j*Pi/(k + 1)))^n for n > 0, T(0, 0) = 1. Triangle read by rows, T(n, k) for 0 <= k <= n.at n=54A342911