OEIS A000322: Pentanacci numbers

A deep dive into A000322, the Pentanacci sequence started with five 1s, defined by a(n) = a(n-1) + a(n-2) + a(n-3) + a(n-4) + a(n-5). We'll contrast with the zero-start version A01591 to show how different initial conditions under the same recurrence yield very different early terms. Learn why both share the same long-run growth—the pentanacci constant, about 1.9659482—and how initial values sculpt the early landscape. We’ll explore A000322’s appearance in combinatorics (counting constrained words) and the surprising link to Benford’s law, then close by inviting listeners to ponder how many other simple recurrences hide distinct families just by tweaking the starting values.

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