login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108361 Diagonal sums of number triangle A108359. 1
1, 1, 2, 4, 7, 13, 25, 47, 90, 172, 329, 629, 1202, 2294, 4374, 8330, 15847, 30115, 57172, 108434, 205473, 389019, 735927, 1391121, 2627720, 4960134, 9356707, 17639323, 33234036, 62580444, 117776828, 221542596, 416524573, 782743029 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

FORMULA

a(n)=sum{k=0..floor(n/2), sum{j=0..n-2k, C(k, j)C(n-k-j, k)*floor((j+2)/2)}}.

CROSSREFS

Sequence in context: A079958 A018082 A018083 * A082423 A176485 A119266

Adjacent sequences:  A108358 A108359 A108360 * A108362 A108363 A108364

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), May 31 2005

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 14 08:58 EST 2012. Contains 205614 sequences.