A127227 a(n)= numerator of ((n + 3)! - (n - 3)!)/(n!).

719, 5039, 20159, 60479, 151199, 332639, 665279, 1235519, 2162159, 3603599, 5765759, 8910719, 13366079, 19535039, 27907199, 39070079, 53721359, 72681839, 96909119, 127511999, 165765599, 213127199, 271252799, 342014399, 427517999

Offset

3,1

Links

Table of n, a(n) for n=3..27.

Mathematica

Table[Numerator[((n + 3)! - (n - 3)!)/(n!)], {n, 3, 30}]

Crossrefs

Cf. A028387, A062938, A127228, A127229, A127230.

Sequence in context: A081425 A101797 A144767 * A139177 A064980 A290120

Adjacent sequences: A127224 A127225 A127226 * A127228 A127229 A127230

Keyword

nonn,frac

Author

Artur Jasinski, Jan 09 2007

Status

approved