a(n) = (2^n-1)^4 - 2.A118558a(n) = (2^n-1)^4 - 2.Terms a(0) =-2a(1) =-1a(2) =79a(3) =2399a(4) =50623a(5) =923519a(6) =15752959a(7) =260144639a(8) =4228250623a(9) =68184176639External referencesoeis: A118558