Once a presidential candidate with deep misgivings about executive power, Mr. Obama will leave the White House as one of the most prolific authors of major regulations in presidential history.

Blocked for most of his presidency by Congress, Mr. Obama has sought to act however he could. In the process he created the kind of government neither he nor the Republicans wanted — one that depended on bureaucratic bulldozing rather than legislative transparency. But once Mr. Obama got the taste for it, he pursued his executive power without apology, and in ways that will shape the presidency for decades to come.

The Obama administration in its first seven years finalized 560 major regulations — those classified by the Congressional Budget Office as having particularly significant economic or social impacts. That was nearly 50 percent more than the George W. Bush administration during the comparable period, according to data kept by the regulatory studies center at George Washington University.

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