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!)
A143038 Triangle read by rows, A000012 * A134309 * A000012; where A134309 = an infinite lower triangular matrix with (1, 1, 2, 4, 8, 16,...) in the main diagonal and the rest zeros. 1
1, 1, 2, 2, 3, 4, 4, 6, 7, 8, 8, 12, 14, 15, 16, 16, 24, 28, 30, 31, 32, 32, 48, 56, 60, 62, 63, 64, 64, 96, 112, 120, 124, 126, 127, 128, 128, 192, 224, 240, 248, 252, 254, 255, 256, 256, 384, 448, 480, 496, 504, 508, 510, 511, 512 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

Row sums = A002064, the Cullen numbers (1, 3, 9, 25, 65, 161, 385,...).

LINKS

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

FORMULA

a(n) = 2^i - 2^(i-1-j)*[j<i], where i = A003056(n), j = A002262(n). - Yuchun Ji, May 15 2020

EXAMPLE

First few rows of the triangle are:

1;

1, 2;

2, 3, 4;

4, 6, 7, 8;

8, 12, 14, 15, 16;

16, 24, 28, 30, 21, 32;

32, 48, 56, 60, 62, 63, 64;

...

CROSSREFS

Cf. A134309, A002064.

Cf. A002262, A003056, A023532.

Sequence in context: A114093 A239950 A077768 * A029040 A053281 A339395

Adjacent sequences:  A143035 A143036 A143037 * A143039 A143040 A143041

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 18 2008

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 May 18 07:26 EDT 2021. Contains 343995 sequences. (Running on oeis4.)