42846

Appears in sequences

• Enneagonal numbers whose sum of digits is also enneagonal.at n=15A117051
• G.f. satisfies: A(x*D(-x)) = x where D(x) = g.f. of A014577, the dragon curve sequence.at n=10A206463
• a(n) = 2*n*(16*n - 13).at n=37A263228
• a(n) = n*(7*n - 5)*(49*n^2 - 35*n - 10)/8.at n=6A264894