|
Search: id:A026773
|
|
| |
|
| 1, 4, 17, 76, 352, 1674, 8129, 40156, 201236, 1020922, 5234660, 27089726, 141335846, 742712598, 3927908193, 20891799036, 111688381228, 599841215226, 3234957053984, 17512055200470, 95125188934942, 518340392855286
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
FORMULA
|
a(n) = A006318(n) - A000108(n). G.f.: (sqrt(1-4*x)-sqrt(1-6*x+x^2))/(2*x)-1/2. - Vladeta Jovovic (vladeta(AT)Eunet.yu), Nov 23 2003
a(n)=sum{k=0..n, C(n+k+1, n+1)C(n+1, k)/(k+1)}; a(n)=sum{k=0..n+1, C(n+2, k)C(n+k, n+1)}/(n+2). - Paul Barry (pbarry(AT)wit.ie), May 19 2005
|
|
CROSSREFS
|
Sequence in context: A026378 A117439 A081910 this_sequence A081186 A005572 A081922
Adjacent sequences: A026770 A026771 A026772 this_sequence A026774 A026775 A026776
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Clark Kimberling (ck6(AT)evansville.edu)
|
|
|
Search completed in 0.002 seconds
|
