1222872633

Appears in sequences

• a(1)=1, a(n) = n*4^(n-1) + a(n-1).at n=13A014916
• a(n) = ((3*n+1)*2^n - (-1)^n)/9.at n=27A045883
• Expansion of 1 / ( (1+x)*(2*x+1)*(-1+2*x)^2 ).at n=27A140787