|
| |
|
|
A154324
|
|
Diagonal sums of number triangle A113582.
|
|
0
| |
|
|
1, 1, 2, 3, 6, 12, 23, 43, 74, 124, 195, 300, 441, 637, 890, 1226, 1647, 2187, 2848, 3673, 4664, 5874, 7305, 9021, 11024, 13390, 16121, 19306, 22947, 27147, 31908, 37348, 43469, 50405, 58158, 66879, 76570, 87400, 99371, 112671, 127302
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,3
|
|
|
LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,0,-8,6,6,-8,0,3,-1).
|
|
|
FORMULA
| G.f.: (1-2x-x^2+5x^3-x^4-2x^5+x^6)/((1-x)*(1-x^2))^3; a(n)=sum{k=0..floor(n/2), 1+C(k+1,2)*C(n-2k+1,2)}.
|
|
|
CROSSREFS
| Sequence in context: A060985 A068012 A019138 * A001630 A164363 A103341
Adjacent sequences: A154321 A154322 A154323 * A154325 A154326 A154327
|
|
|
KEYWORD
| easy,nonn
|
|
|
AUTHOR
| Paul Barry (pbarry(AT)wit.ie), Jan 07 2009
|
| |
|
|
