Expansion of g.f. 8/(1-2*z)-12/(1-z)+z+5.

Terms

a(0) =1a(1) =5a(2) =20a(3) =52a(4) =116a(5) =244a(6) =500a(7) =1012a(8) =2036a(9) =4084a(10) =8180a(11) =16372a(12) =32756a(13) =65524a(14) =131060a(15) =262132a(16) =524276a(17) =1048564a(18) =2097140a(19) =4194292a(20) =8388596a(21) =16777204a(22) =33554420a(23) =67108852a(24) =134217716a(25) =268435444a(26) =536870900a(27) =1073741812a(28) =2147483636