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A279679 Irregular triangle read by rows: possible numbers of diagonals of an n-edged convex polyhedron.

%I A279679 #14 Dec 24 2016 11:19:36
%S A279679 0,0,0,1,0,1,1,2,0,2,3,4,2,3,4,5,0,3,4,5,6,7,3,4,5,6,7,8,9,10,0,4,6,7,
%T A279679 8,9,10,11,12,13,4,5,7,8,9,10,11,12,13,14,15,16,0,5,8,9,10,11,12,13,
%U A279679 14,15,16,17,18,19,20
%N A279679 Irregular triangle read by rows: possible numbers of diagonals of an n-edged convex polyhedron.
%C A279679 The beginning of the irregular triangle is:
%C A279679 6  | 0;
%C A279679 7  | -
%C A279679 8  | 0;
%C A279679 9  | 0, 1;
%C A279679 10 | 0, 1;
%C A279679 11 | 1, 2;
%C A279679 12 | 0, 2, 3, 4;
%C A279679 13 | 2, 3, 4, 5;
%C A279679 14 | 0, 3, 4, 5,  6,  7;
%C A279679 15 | 3, 4, 5, 6,  7,  8,  9, 10;
%C A279679 16 | 0, 4, 6, 7,  8,  9, 10, 11, 12, 13;
%C A279679 17 | 4, 5, 7, 8,  9, 10, 11, 12, 13, 14, 15, 16;
%C A279679 18 | 0, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20;
%Y A279679 Cf. A279015, A279019, A279022, A279620, A279647, A279681.
%K A279679 nonn,tabf
%O A279679 6,8
%A A279679 _Vladimir Letsko_, Dec 16 2016