An oscillating sequence: a(n) = n^2 + 2^(n-1) - 2*a(n-1), n>0, with a(1) = 1.

Terms

a(0) =1a(1) =4a(2) =5a(3) =14a(4) =13a(5) =42a(6) =29a(7) =134a(8) =69a(9) =474a(10) =197a(11) =1798a(12) =669a(13) =7050a(14) =2509a(15) =28006a(16) =9813a(17) =111770a(18) =38965a(19) =446758a(20) =155501a(21) =1786634a(22) =621565a(23) =7146054a(24) =2485733a(25) =28583642a(26) =9942309a(27) =114333894a(28) =39768509a(29) =457334794