33678

Appears in sequences

• a(n) = (2*(-1)^n - 2^(n+1) + 3*n*2^n)/9.at n=13A140960
• a(n) = Sum_{k=0..n} k^p*q^k, where p=1, q=-2.at n=12A232600
• G.f.: Sum_{n>=1} Pell(n+1) * x^n / (1 - x^n), where Pell(n) = A000129(n).at n=11A256272