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A279679 Irregular triangle read by rows: possible numbers of diagonals of an n-edged convex polyhedron. 2
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 (list; graph; refs; listen; history; text; internal format)
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 A028376

Adjacent sequences:  A279676 A279677 A279678 * A279680 A279681 A279682

KEYWORD

nonn,tabf

AUTHOR

Vladimir Letsko, Dec 16 2016

STATUS

approved

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Last modified October 19 18:19 EDT 2021. Contains 348091 sequences. (Running on oeis4.)