Transform of the finite sequence (1, 0, -1) by the T_{1,1} transformation (see link).

Terms

a(0) =2a(1) =4a(2) =9a(3) =23a(4) =54a(5) =125a(6) =290a(7) =674a(8) =1567a(9) =3643a(10) =8469a(11) =19688a(12) =45769a(13) =106400a(14) =247350a(15) =575019a(16) =1336757a(17) =3107583a(18) =7224254a(19) =16794353a(20) =39042134a(21) =90761950a(22) =210995935a(23) =490506039a(24) =1140288197a(25) =2650848448a(26) =6162474989a(27) =14326016268a(28) =33303947274