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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A274636 Square array read by antidiagonals: T(m,n) (m>=0, n>=0) = (2^floor(m/2)+1)*(2^ceiling(n/2)+1). 3
4, 4, 6, 6, 6, 6, 6, 9, 6, 10, 10, 9, 9, 10, 10, 10, 15, 9, 15, 10, 18, 18, 15, 15, 15, 15, 18, 18, 18, 27, 15, 25, 15, 27, 18, 34, 34, 27, 27, 25, 25, 27, 27, 34, 34, 34, 51, 27, 45, 25, 45, 27, 51, 34, 66, 66, 51, 51, 45, 45, 45, 45, 51, 51, 66, 66, 66, 99, 51, 85, 45, 81, 45, 85, 51, 99, 66, 130 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..77.

EXAMPLE

The array begins:

4, 6, 6, 10, 10, 18, 18, 34, 34, 66, 66, 130, 130, ...

4, 6, 6, 10, 10, 18, 18, 34, 34, 66, 66, 130, 130, ...

6, 9, 9, 15, 15, 27, 27, 51, 51, 99, 99, 195, 195, ...

6, 9, 9, 15, 15, 27, 27, 51, 51, 99, 99, 195, 195, ...

10, 15, 15, 25, 25, 45, 45, 85, 85, 165, 165, 325, 325, ...

10, 15, 15, 25, 25, 45, 45, 85, 85, 165, 165, 325, 325, ...

18, 27, 27, 45, 45, 81, 81, 153, 153, 297, 297, 585, 585, ...

...

CROSSREFS

The main diagonal is conjectured to be A183978. Cf. A274635, A274637.

Sequence in context: A121064 A213342 A019559 * A198697 A111657 A049751

Adjacent sequences:  A274633 A274634 A274635 * A274637 A274638 A274639

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Jul 08 2016

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 April 5 13:14 EDT 2020. Contains 333241 sequences. (Running on oeis4.)