login
This site is supported by donations to The OEIS Foundation.

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A134247 A007318 * triangle by rows, n-th row = (n-1) zeros followed by T(n), 1. 1
1, 2, 1, 3, 5, 1, 4, 12, 9, 1, 5, 22, 30, 14, 1, 6, 35, 70, 60, 20, 1, 7, 51, 135, 170, 105, 27, 1, 8, 70, 231, 385, 350, 168, 35, 1, 9, 92, 364, 756, 910, 644, 252, 44, 1, 10, 117, 540, 1344, 2016, 1890, 1092, 360, 54, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Row sums = A072863: (1, 3, 9, 26, 72, 192, 496,...).

LINKS

Table of n, a(n) for n=0..54.

FORMULA

Binomial transform of an infinite lower triangular matrix having n-th row = (n-1) zeros followed by T(n), 1, where T(n) = n-th triangular number.

EXAMPLE

First few rows of the triangle are:

1;

2, 1;

3, 5, 1;

4, 12, 9, 1;

5, 22, 30, 14, 1;

6, 35, 70, 60, 20, 1;

7, 51, 135, 170, 105, 27, 1;

...

CROSSREFS

Cf. A072863, A000217.

Sequence in context: A118243 A210233 A134081 * A210225 A180906 A153277

Adjacent sequences:  A134244 A134245 A134246 * A134248 A134249 A134250

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Oct 15 2007

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 3 21:14 EST 2016. Contains 278745 sequences.