|
Search: id:A101609
|
|
|
| A101609 |
|
n! * Sum[k=1..floor(n/2), 1/k]. |
|
+0
5
|
|
| 0, 2, 6, 36, 180, 1320, 9240, 84000, 756000, 8285760, 91143360, 1173553920, 15256200960, 226040855040, 3390612825600, 56865153945600, 966707617075200, 18112111963545600, 344130127307366400, 7125892746964992000
(list; graph; listen)
|
|
|
OFFSET
|
1,2
|
|
|
MATHEMATICA
|
Table[ n! HarmonicNumber[ Floor[ n/2]], {n, 20}] (from Robert G. Wilson v Dec 11 2004)
|
|
CROSSREFS
|
Cf. A101610, A101611, A101612, A101613, A000254, A046673, A052517.
Sequence in context: A127564 A130874 A019020 this_sequence A086325 A074424 A002868
Adjacent sequences: A101606 A101607 A101608 this_sequence A101610 A101611 A101612
|
|
KEYWORD
|
nonn,easy
|
|
AUTHOR
|
Ralf Stephan, Dec 10 2004
|
|
|
Search completed in 0.002 seconds
|
