login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A168533 Triangle read by rows, A000012 * A168532, as infinite lower triangular matrices. 1
1, 2, 1, 4, 1, 1, 7, 2, 1, 1, 13, 2, 1, 1, 1, 20, 4, 2, 1, 1, 1, 34, 4, 2, 1, 1, 1, 1, 51, 7, 2, 2, 1, 1, 1, 1, 78, 7, 4, 2, 1, 1, 1, 1, 1, 112, 13, 4, 2, 2, 2, 21, 1, 1, 167, 13, 4, 2, 2, 1, 1, 1, 1, 1, 1, 230, 20, 7, 4, 2, 2, 21, 1, 1, 1, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = A026905: (1, 3, 6, 11, 18, 29, 44, 66,...)

Triangle A168534 = A168532 * A000012

LINKS

Table of n, a(n) for n=1..77.

FORMULA

Triangle read by rows, A000012 * A168532; where A000012 = an infinite lower

triangular matrix with all 1's. The operation takes partial sums of A168532

column terms.

EXAMPLE

First few rows of the triangle =

1;

2, 1;

4, 1, 1;

7, 2, 1, 1;

13, 2, 1, 1, 1;

20, 4, 2, 1, 1, 1;

34, 4, 2, 1, 1, 1, 1;

51, 7, 2, 2, 1, 1, 1, 1;

78, 7, 4, 2, 1, 1, 1, 1, 1;

112, 13, 4, 2, 2, 1, 1, 1, 1, 1;

167, 13, 4, 2, 2, 1, 1, 1, 1, 1, 1;

230, 20, 7, 4, 2, 2, 1, 1, 1, 1, 1, 1;

330, 20, 7, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1;

449, 34, 7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1;

616, 34, 13, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1;

825, 51, 13, 7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1;

1121, 51, 13, 7, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1;

CROSSREFS

Cf. A168532, A026905, A168534

Sequence in context: A099510 A211232 A137633 * A191314 A191306 A191525

Adjacent sequences:  A168530 A168531 A168532 * A168534 A168535 A168536

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Nov 28 2009

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
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified November 30 08:16 EST 2021. Contains 349419 sequences. (Running on oeis4.)