9033180

Appears in sequences

• a(n) = 2*a(n-1) + 11*a(n-2), a(0) = 0, a(1) = 1.at n=12A015520
• a(n) = ((1 + sqrt(n))^n - (1 - sqrt(n))^n)/(2*sqrt(n)).at n=11A357502