OFFSET
1,2
COMMENTS
The terms are from numeric computation - no formula for a(n) is currently known.
LINKS
Scott R. Shannon, Regions for n = 2.
Scott R. Shannon, Regions for n = 3.
Scott R. Shannon, Regions for n = 4.
Scott R. Shannon, Regions for n = 6.
Scott R. Shannon, Regions for n = 8.
Scott R. Shannon, Regions for n = 10.
Scott R. Shannon, Regions for n = 14.
Scott R. Shannon, Regions for n = 15.
Wikipedia, Circular triangle.
CROSSREFS
KEYWORD
nonn
AUTHOR
Scott R. Shannon and N. J. A. Sloane, Jan 16 2021
STATUS
approved