a(n) = (b(n)+1)^b(n+1) + b(n+2)^(b(n+1)+1)/2, where b(n) = [n/2]*2 = A052928(n) =(0,0,2,2,4,4,...), even numbers repeated.

A218057

a(n) = (b(n)+1)^b(n+1) + b(n+2)^(b(n+1)+1)/2, where b(n) = [n/2]*2 = A052928(n) =(0,0,2,2,4,4,...), even numbers repeated.

Terms

    a(0) =2a(1) =5a(2) =41a(3) =593a(4) =4513a(5) =155593a(6) =1166225a(7) =72873665a(8) =543046721a(9) =53486784401a(10) =397441609945

External references