a(n) = (4*n - 3) * 2^(n - 1).

Terms

a(0) =1a(1) =10a(2) =36a(3) =104a(4) =272a(5) =672a(6) =1600a(7) =3712a(8) =8448a(9) =18944a(10) =41984a(11) =92160a(12) =200704a(13) =434176a(14) =933888a(15) =1998848a(16) =4259840a(17) =9043968a(18) =19136512a(19) =40370176a(20) =84934656a(21) =178257920a(22) =373293056a(23) =780140544a(24) =1627389952a(25) =3388997632a(26) =7046430720a(27) =14629732352a(28) =30333206528a(29) =62813896704