Nim product 2^n * 2^n.

Terms

a(0) =1a(1) =3a(2) =6a(3) =13a(4) =24a(5) =52a(6) =103a(7) =222a(8) =384a(9) =832a(10) =1648a(11) =3552a(12) =6237a(13) =13563a(14) =26511a(15) =56906a(16) =98304a(17) =212992a(18) =421888a(19) =909312a(20) =1596672a(21) =3472128a(22) =6786816a(23) =14567936a(24) =25190110a(25) =54589881a(26) =108036850a(27) =232800673a(28) =408783316a(29) =888883132