|
| |
|
|
A081205
|
|
Staircase on Pascal's triangle.
|
|
1
|
|
|
|
1, 3, 10, 20, 70, 126, 462, 792, 3003, 5005, 19448, 31824, 125970, 203490, 817190, 1307504, 5311735, 8436285, 34597290, 54627300, 225792840, 354817320, 1476337800, 2310789600, 9669554100, 15084504396, 63432274896, 98672427616
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
0,2
|
|
|
COMMENTS
|
Arrange Pascal's triangle as a square array. A081204 is then a diagonal staircase on the square array. The steps are (1,3),(10,20),(70,126),(462,792),....
|
|
|
LINKS
|
Table of n, a(n) for n=0..27.
|
|
|
FORMULA
|
a(n)=binomial(ceiling((n+1)/2)+(n+1), n).
|
|
|
CROSSREFS
|
Cf. A065942, A081181, A081204.
Sequence in context: A208951 A005997 A213850 * A092305 A196166 A073604
Adjacent sequences: A081202 A081203 A081204 * A081206 A081207 A081208
|
|
|
KEYWORD
|
easy,nonn
|
|
|
AUTHOR
|
Paul Barry, Mar 11 2003
|
|
|
STATUS
|
approved
|
| |
|
|
