A055144 The first n digits of the juxtaposition of the base-3 numbers converted to decimal.
1, 5, 16, 48, 145, 436, 1309, 3929, 11789, 35367, 106103, 318310, 954932, 2864798, 8594395, 25783185, 77349555, 232048666, 696145998, 2088437995, 6265313986, 18795941958, 56387825876, 169163477629, 507490432888, 1522471298664
Offset: 1
Examples
1 (1); 12 (5); 121 (16); 1210 (48); 12101 (145); 121011 (436); ...