OFFSET
1,2
COMMENTS
The sequence gives the areas multiplied by 2.
For more information see A322740.
The coordinates of the 10 grid points on the minimal 19 X 18 rectangle are (0,3), (1,9), (2,18), (5,0), (5,10), (12,17), (15,13), (17,4), (18,0), (19,5).
LINKS
Hugo Pfoertner, Table of n, a(n) for n = 1..120
PROG
(PARI) X=[0, 1, 2, 5, 5, 12, 15, 17, 18, 19]; Y=[3, 9, 18, 0, 10, 17, 13, 4, 0, 5]; n=0; a=vector(binomial(#X, 3)); for(i=1, #X-2, for(j=i+1, #X-1, for(k=j+1, #X, a[n++]=X[i]*(Y[j]-Y[k])+X[j]*(Y[k]-Y[i])+X[k]*(Y[i]-Y[j]))))
vecsort(abs(a))
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
Hugo Pfoertner, Dec 24 2018
STATUS
approved