Pasquale's sequence: a(n) = 2a(n-1) + (-1)^n*floor(n/2), with a(1)=1.

Terms

a(0) =1a(1) =3a(2) =5a(3) =12a(4) =22a(5) =47a(6) =91a(7) =186a(8) =368a(9) =741a(10) =1477a(11) =2960a(12) =5914a(13) =11835a(14) =23663a(15) =47334a(16) =94660a(17) =189329a(18) =378649a(19) =757308a(20) =1514606a(21) =3029223a(22) =6058435a(23) =12116882a(24) =24233752a(25) =48467517a(26) =96935021a(27) =193870056a(28) =387740098a(29) =775480211