OFFSET
1,2
LINKS
D. E. Knuth (Proposer), Tight m-by-n pavings; Problem 12005, Amer. Math. Monthly 124 (No. 8, Oct. 2017), page 755.
D. E. Knuth, A conjecture that had to be true, Stanford Lecture: Don Knuth's Christmas Tree Lecture 2017.
FORMULA
a(n) = A285357(n,n).
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Peter Luschny, Jan 19 2018
EXTENSIONS
a(6) from Hugo Pfoertner, Jan 19 2018
a(7) from Denis Roegel, Feb 23 2018
a(8) from Denis Roegel, Feb 24 2018
STATUS
approved