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A127773 Triangle read by rows: row n consists of n-1 zeros followed by n(n+1)/2. 11
1, 0, 3, 0, 0, 6, 0, 0, 0, 10, 0, 0, 0, 0, 15, 0, 0, 0, 0, 0, 21, 0, 0, 0, 0, 0, 0, 28, 0, 0, 0, 0, 0, 0, 0, 36, 0, 0, 0, 0, 0, 0, 0, 0, 45, 0, 0, 0, 0, 0, 0, 0, 0, 0, 55 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..55.

EXAMPLE

First few rows of the triangle are:

1;

0, 3;

0, 0, 6;

0, 0, 0, 10;

0, 0, 0, 0, 15;

...

MATHEMATICA

Flatten[Table[{(n(n+1))/2, Table[0, {n}]}, {n, 10}]]  (* Harvey P. Dale, Apr 03 2011 *)

CROSSREFS

Cf. A127648, A000217, A127774.

Sequence in context: A051174 A273089 A330735 * A194498 A193986 A062688

Adjacent sequences:  A127770 A127771 A127772 * A127774 A127775 A127776

KEYWORD

nonn,easy,tabl

AUTHOR

Gary W. Adamson, Jan 28 2007

STATUS

approved

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Last modified September 22 13:53 EDT 2020. Contains 337289 sequences. (Running on oeis4.)