A091422 Write the natural numbers in binary, break the result up into blocks of 2 digits each and convert each block back into decimal.

3, 1, 3, 0, 2, 3, 2, 3, 3, 0, 1, 0, 3, 1, 1, 1, 3, 2, 1, 2, 3, 3, 1, 3, 3, 0, 0, 2, 0, 3, 0, 2, 2, 1, 3, 1, 0, 2, 2, 3, 1, 2, 2, 3, 3, 2, 0, 3, 0, 3, 2, 2, 3, 1, 3, 3, 0, 3, 2, 3, 3, 2, 3, 3, 3, 0, 0, 1, 0, 0, 3, 0, 1, 1, 0, 1, 3, 0, 2, 1, 0, 2, 3, 0, 3, 1, 0, 3, 3, 1, 0, 1, 1, 0, 3, 1, 1, 1, 1, 1, 3, 1, 2, 1, 1