2097025

Appears in sequences

• a(n) = Sum{i=1..n} ( i*2^(i-1) ) - ( A002024(n)*(A002024(n)+1)/2 - n ) * 2^(A002024(n)-1).at n=16A135471
• a(n) = 8^n - 2^n + 1^n.at n=7A155599
• a(n) = abs(2^n-127).at n=21A176303