Numbers in Morse code, with 1 for a dot, 2 for a dash and 0 between digits/letters.

Terms

a(0) =22222a(1) =12222a(2) =11222a(3) =11122a(4) =11112a(5) =11111a(6) =21111a(7) =22111a(8) =22211a(9) =22221a(10) =12222022222a(11) =12222012222a(12) =12222011222a(13) =12222011122a(14) =12222011112a(15) =12222011111a(16) =12222021111a(17) =12222022111a(18) =12222022211a(19) =12222022221a(20) =11222022222a(21) =11222012222a(22) =11222011222a(23) =11222011122a(24) =11222011112a(25) =11222011111