|
| |
|
|
A026773
|
|
T(2n-1,n-1), T given by A026769. Also T(2n+1,n+1), T given by A026780.
|
|
0
| |
|
|
1, 4, 17, 76, 352, 1674, 8129, 40156, 201236, 1020922, 5234660, 27089726, 141335846, 742712598, 3927908193, 20891799036, 111688381228, 599841215226, 3234957053984, 17512055200470, 95125188934942, 518340392855286
(list; graph; refs; listen; history; internal format)
|
|
|
|
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.rs), 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: A151247 A117439 A081910 * A081186 A005572 A202879
Adjacent sequences: A026770 A026771 A026772 * A026774 A026775 A026776
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
|
| |
|
|
