OFFSET
1,3
LINKS
Lucas A. Brown, Table of n, a(n) for n = 1..71
Lucas A. Brown, A355553.py.
EXAMPLE
a(4)=54: There are 4 horizontal lines of length 4 and within a line of 4 dots are 5 ways to select a line 3 or longer. There are 2 diagonal lines of length 4 and 4 vertical lines of length 4. Finally there are 4 diagonals of length 3 these are: ((1,2),(2,3),(3,4)),((2,1),(3,2),(4,3)),((1,3),(2,2),(3,1)),((2,4),(3,3),(4,2). In total we have 5*10+4=54.
4 . . . .
3 . . . .
2 . . . .
1 . . . .
1 2 3 4
CROSSREFS
KEYWORD
nonn
AUTHOR
Thomas Garrison, Jul 14 2022
EXTENSIONS
Corrected and extended by Lucas A. Brown, Nov 06 2022
STATUS
approved