login
A028026
Expansion of 1/((1-3x)(1-4x)(1-5x)(1-7x)).
0
1, 19, 230, 2270, 19971, 163569, 1278040, 9670540, 71557541, 521211119, 3754036650, 26822296410, 190541788711, 1347984742669, 9507913700060, 66919750327880, 470277075161481, 3301201972518219, 23154999755212270, 162319024049252950, 1137407684744763851
OFFSET
0,2
FORMULA
a(n) = (7^(n+3)-6*5^(n+3)+8*4^(n+3)-3^(n+4))/24. - Yahia Kahloune, May 22 2013.
MATHEMATICA
CoefficientList[Series[1/((1-3x)(1-4x)(1-5x)(1-7x)), {x, 0, 20}], x] (* Harvey P. Dale, Apr 05 2019 *)
CROSSREFS
Sequence in context: A243420 A125431 A104116 * A135487 A025965 A276201
KEYWORD
nonn,easy
AUTHOR
STATUS
approved