a(n) = 3*a(n-1) + 5 with a(0) = 1.

Terms

a(0) =1a(1) =8a(2) =29a(3) =92a(4) =281a(5) =848a(6) =2549a(7) =7652a(8) =22961a(9) =68888a(10) =206669a(11) =620012a(12) =1860041a(13) =5580128a(14) =16740389a(15) =50221172a(16) =150663521a(17) =451990568a(18) =1355971709a(19) =4067915132a(20) =12203745401a(21) =36611236208a(22) =109833708629a(23) =329501125892a(24) =988503377681