OFFSET
1,2
COMMENTS
a(1) = 1. Each term a(n) = k is followed by the k smallest so-far-unseen natural numbers. Invented by Eric Angelini. Another way to say it (Angelini's formulation) is that when subjected to an erasure transformation, the k terms after a(n) = k are deleted, the original sequence is recovered; and if otherwise unconstrained, the natural numbers are introduced as soon as possible.
LINKS
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Allan C. Wechsler, May 20 2023
STATUS
approved