What is pattern rule for 1-4-9-1-6-2-5-3-6-4-9-6-4-8-1?

The sequence 1-4-9-1-6-2-5-3-6-4-9-6-4-8-1 does not follow a clear, consistent mathematical pattern. However, it appears to include a combination of both single-digit and two-digit numbers, possibly reflecting a mix of operations or a random arrangement. To identify a specific pattern or rule, further context or a defined method for generating the sequence would be necessary.