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

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, 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, 14, 15, 16, 17, 18, 19, 20

Offset

6,8

Comments

The beginning of the irregular triangle is:

6 | 0;

7 | -

8 | 0;

9 | 0, 1;

10 | 0, 1;

11 | 1, 2;

12 | 0, 2, 3, 4;

13 | 2, 3, 4, 5;

14 | 0, 3, 4, 5, 6, 7;

15 | 3, 4, 5, 6, 7, 8, 9, 10;

16 | 0, 4, 6, 7, 8, 9, 10, 11, 12, 13;

17 | 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16;

18 | 0, 5, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20;

Links

Table of n, a(n) for n=6..72.

Crossrefs

Cf. A279015, A279019, A279022, A279620, A279647, A279681.

Sequence in context: A063180 A263624 A141693 * A261096 A257092 A374705

Adjacent sequences: A279676 A279677 A279678 * A279680 A279681 A279682

Keyword

nonn,tabf

Author

Vladimir Letsko, Dec 16 2016

Status

approved