Abstract
We evaluate the number u(n) of length-n finite sequences (ak)1≤k≤n of natural numbers that satisfy the inequality ak ≤ k2 for all k. We thus determine two recurrence relations for u(n) by two different methods, and we give an explicit expression in closed form for it.
Original language | English (US) |
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Article number | 15.1.8 |
Journal | Journal of Integer Sequences |
Volume | 18 |
Issue number | 1 |
State | Published - Jan 13 2015 |
All Science Journal Classification (ASJC) codes
- Discrete Mathematics and Combinatorics