Logo

Greetings from The On-Line Encyclopedia of Integer Sequences!

Hints

Search: id:A136577
Displaying 1-1 of 1 results found. page 1
     Format: long | short | internal | text      Sort: relevance | references | number      Highlight: on | off
A136577 Conjectured Hankel transform of A136576(n+1). +0
3
1, 1, 0, -16, -256, -4096, 0, 16777216, 4294967296, 1099511627776, 0, -1152921504606846976, -4722366482869645213696, -19342813113834066795298816, 0, 5192296858534827628530496329220096, 340282366920938463463374607431768211456 (list; graph; listen)
OFFSET

0,4

COMMENT

a(n+1) is the Hankel transform of A086616. [From Paul Barry (pbarry(AT)wit.ie), Jun 03 2009]

FORMULA

a(n)=4^floor(n^2/2)*((1/2-sqrt(2)/2)*cos(3*pi*n/4)+(1/2+sqrt(2)/2)*cos(pi*n/4));

CROSSREFS

Sequence in context: A017570 A016744 A122609 this_sequence A001025 A144318 A067223

Adjacent sequences: A136574 A136575 A136576 this_sequence A136578 A136579 A136580

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jan 08 2008

page 1

Search completed in 0.002 seconds

Lookup | Welcome | Find friends | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
More pages | Superseeker | Maintained by N. J. A. Sloane (njas@research.att.com)

Last modified December 19 12:50 EST 2009. Contains 171053 sequences.


AT&T Labs Research