|
Search: id:A135712
|
|
|
| A135712 |
|
(4*n^3+11*n^2+9*n+2)/2. |
|
+0
2
|
|
| 1, 13, 48, 118, 235, 411, 658, 988, 1413, 1945, 2596, 3378, 4303, 5383, 6630, 8056, 9673, 11493, 13528, 15790, 18291, 21043, 24058, 27348, 30925, 34801, 38988, 43498, 48343, 53535, 59086, 65008, 71313, 78013, 85120, 92646, 100603, 109003, 117858, 127180
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
Binomial transform yields 1,12,23,12,0,0,0,0,0,0,.. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 21 2008
|
|
REFERENCES
|
M. E. Larsen, The eternal triangle - a history of a counting problem, College Math. J., 20 (1989), 370-392.
|
|
FORMULA
|
O.g.f. (1+9*x+2*x^2)/(-1+x)^4. - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 21 2008
|
|
CROSSREFS
|
Bisection of A002717.
Sequence in context: A004467 A141865 A146806 this_sequence A027980 A013200 A156694
Adjacent sequences: A135709 A135710 A135711 this_sequence A135713 A135714 A135715
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
N. J. A. Sloane (njas(AT)research.att.com), Mar 05 2008
|
|
|
Search completed in 0.002 seconds
|
