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A279647 Irregular triangle read by rows: possible numbers of the diagonals of an n-faced convex polyhedron. 2
0, 0, 0, 1, 2, 4, 0, 2, 3, 4, 5, 6, 7, 9, 10, 0, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 0, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,5

COMMENTS

Triangle begins:

4 | 0;

5 | 0;

6 | 0, 1, 2, 4;

7 | 0, 2, 3, 4, 5, 6, 7,  9, 10;

8 | 0, 3, 4, 5, 6, 7, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20;

LINKS

Table of n, a(n) for n=4..66.

CROSSREFS

Cf. A279015, A279019, A279022, A279620, A279679, A279681.

Sequence in context: A011165 A188672 A228518 * A028963 A004516 A281499

Adjacent sequences:  A279644 A279645 A279646 * A279648 A279649 A279650

KEYWORD

nonn,tabf,more

AUTHOR

Vladimir Letsko, Dec 16 2016

STATUS

approved

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Last modified May 25 19:29 EDT 2019. Contains 323576 sequences. (Running on oeis4.)