|
| |
|
|
A011919
|
|
[ n(n-1)(n-2)(n-3)/9 ].
|
|
0
| |
|
|
0, 0, 0, 0, 2, 13, 40, 93, 186, 336, 560, 880, 1320, 1906, 2669, 3640, 4853, 6346, 8160, 10336, 12920, 15960, 19506, 23613, 28336, 33733, 39866, 46800, 54600, 63336, 73080, 83906, 95893, 109120, 123669
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 0,5
|
|
|
FORMULA
| a(n) = +4*a(n-1) -6*a(n-2) +4*a(n-3) -a(n-4) +a(n-9) -4*a(n-10) +6*a(n-11) -4*a(n-12) +a(n-13). G.f.: x^4*(2+5*x+3*x^3+4*x^4+3*x^5+5*x^7+2*x^8) / ( (1-x)^5*(1+x+x^2)*(x^6+x^3+1) ). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Apr 15 2010]
|
|
|
CROSSREFS
| Sequence in context: A005113 A072857 A119535 * A042795 A179925 A157185
Adjacent sequences: A011916 A011917 A011918 * A011920 A011921 A011922
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
|
| |
|
|
