OFFSET
1,1
COMMENTS
LINKS
Guo-Niu Han, Enumeration of Standard Puzzles, 2011. [Cached copy]
Guo-Niu Han, Enumeration of Standard Puzzles, arXiv:2006.14070 [math.CO], 2020.
FORMULA
a(n) = 2*n^2 - n + 3 (conjectured). - Ralf Stephan, May 15 2007
EXAMPLE
First terms (10 = A, 11 = B, 12 = C) of A100035(a(n)):
...1....2........3............4................5......
1231435425165764736271879869584938291A9BA8B7A6B5A4B3A2B;
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Oct 31 2004
STATUS
approved