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A115215 Sequence obtained by reading the triangles shown below by diagonals. 1
1, 1, 3, 2, 1, 3, 6, 2, 5, 4, 1, 3, 6, 10, 2, 5, 9, 4, 8, 7, 1, 3, 6, 10, 15, 2, 5, 9, 14, 4, 8, 13, 7, 12, 11, 1, 3, 6, 10, 15, 21, 2, 5, 9, 14, 20, 4, 5, 8, 13, 19, 7, 12, 18, 11, 17, 16, 1, 3, 6, 10, 15, 21, 28, 2, 5, 9, 14, 20, 27, 4, 8, 13, 19, 26, 7, 12, 18, 25, 11, 17, 24, 16, 23, 22 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..85.

EXAMPLE

1

1

2 3

1

2 3

4 5 6

1

2 3

4 5 6

7 8 9 10

1

2 3

4 5 6

7 8 9 10

11 12 13 14 15

CROSSREFS

See A124171 for another version.

Sequence in context: A215415 A244477 A035572 * A158275 A147750 A089942

Adjacent sequences:  A115212 A115213 A115214 * A115216 A115217 A115218

KEYWORD

nonn

AUTHOR

Colm Mulcahy, Dec 05 2006

EXTENSIONS

More terms from Jonathan R. Love (japanada11(AT)yahoo.ca), Mar 07 2007

STATUS

approved

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Last modified June 15 17:43 EDT 2019. Contains 324142 sequences. (Running on oeis4.)