82199

Appears in sequences

• Thickened pyramidal numbers: a(n) = 2*(n+1)*n + Sum_{i=1..n} (4*i*(i-1) + 1).at n=39A050533
• a(n) = -1 + Sum_{i=1..n} Sum_{j=1..n} i^j.at n=5A124403
• Number of (n+1)X(n+1) 0..3 symmetric matrices with every 2X2 subblock having one or three distinct values, and new values 0..3 introduced in lower triangle row major order.at n=3A210830