Triangle of numbers 2^i*C(n,i) mod 3 converted to decimal.

Terms

a(0) =1a(1) =5a(2) =13a(3) =29a(4) =142a(5) =377a(6) =757a(7) =3785a(8) =9841a(9) =19685a(10) =98422a(11) =255905a(12) =570862a(13) =2795180a(14) =7421206a(15) =14901545a(16) =74505454a(17) =193720085a(18) =387440173a(19) =1937200865a(20) =5036722249a(21) =11235765017a(22) =55016504566a(23) =146064945221a(24) =293292210961