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

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A145352 Triangle read by rows, A054525 * A157497 0
1, 0, 2, 0, 0, 3, 0, 2, 0, 4, 0, 0, 0, 0, 5, 0, 4, 6, 0, 0, 6, 0, 0, 0, 0, 0, 0, 7, 0, 4, 0, 12, 0, 0, 0, 8, 0, 0, 15, 0, 0, 0, 0, 0, 9, 0, 8, 0, 0, 20, 0, 0, 0, 0, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 0, 4, 21, 36, 0, 30, 0, 0, 0, 0, 0, 12 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Row sums = A156833: (1, 2, 3, 6, 5, 16, 7,...)

LINKS

Table of n, a(n) for n=1..78.

FORMULA

Inverse Mobius transform of triangle A157497.

EXAMPLE

First few rows of the triangle =

1;

0, 2;

0, 0, 3;

0, 2, 0, 4;

0, 0, 0, 0, 5;

0, 4, 6, 0, 0, 6;

0, 0, 0, 0, 0, 0, 7;

0, 4, 0, 12, 0, 0, 0, 8;

0, 0, 15, 0, 0, 0, 0, 0, 9;

0, 8, 0, 0, 20, 0, 0, 0, 0, 10;

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11;

0, 4, 21, 36, 0, 30, 0, 0, 0, 0, 0, 12;

0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13;

0, 12, 0, 0, 0, 0, 42, 0, 0, 0, 0, 0, 0, 14;

...

CROSSREFS

Cf. A157497, A054525, A156833

Sequence in context: A263415 A321459 A143517 * A086834 A332342 A173539

Adjacent sequences:  A145349 A145350 A145351 * A145353 A145354 A145355

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson & Mats Granvik, Mar 01 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 January 17 11:30 EST 2021. Contains 340240 sequences. (Running on oeis4.)