OFFSET
1,2
COMMENTS
The sequence gives the areas multiplied by 2.
For more information see A322740.
The coordinates of the 9 grid points on the minimal 18 X 11 rectangle are (0,3), (1,9), (2,0), (3,10), (4,11), (12,2), (17,11), (18,1), (18,4).
PROG
(PARI) X=[0, 1, 2, 3, 4, 12, 17, 18, 18]; Y=[3, 9, 0, 10, 11, 2, 11, 1, 4]; 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