OFFSET
1,5
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..9870 (the first 140 rows)
EXAMPLE
Triangle begins:
0
0,0
0,4,8
0,12,16,20
0,18,32,36,36
0,24,48,56,60,72
0,30,62,76,84,88,104
0,36,76,104,112,120,132,140
0,42,86,130,136,152,160,184,180
0,48,100,144,180,184,192,216,232,240
0,54,110,166,210,228,232,252,268,284,312
0,60,124,188,240,272,272,296,316,336,352,372
0,66,134,202,258,314,328,332,352,372,400,428,436
0,72,148,224,288,352,380,400,408,432,448,480,508,536
-----
The obtuse angle is 'o'.
For n=3, k=2:
xo. x.. .ox ..x
..x .ox x.. xo.
So T(3,2)=4
-----
For n=3, k=3:
xo. x.. x.. x.. .ox ..x ..x ..x
... o.. ..o ... ... o.. ..o ...
..x ..x ..x .ox x.. x.. x.. xo.
So T(3,3)=8
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
Lars Blomberg, Feb 26 2017
STATUS
approved