|
Search: id:A055798
|
|
| |
|
| 1, 7, 29, 93, 255, 627, 1419, 3003, 6006, 11440, 20878, 36686, 62322, 102714, 164730, 257754, 394383, 591261, 870067, 1258675, 1792505, 2516085, 3484845, 4767165, 6446700, 8625006, 11424492, 14991724
(list; graph; listen)
|
|
|
OFFSET
|
0,2
|
|
|
COMMENT
|
If Y is a 2-subset of an n-set X then, for n>=8, a(n-8) is the number of 8-subsets of X which have no exactly one element in common with Y. - Milan R. Janjic (agnus(AT)blic.net), Dec 28 2007
|
|
FORMULA
|
a(n-8)=binomial(n,8)-2*binomial(n-2,7), n=8,9,10,.... - Milan R. Janjic (agnus(AT)blic.net), Dec 28 2007
|
|
CROSSREFS
|
Adjacent sequences: A055795 A055796 A055797 this_sequence A055799 A055800 A055801
Sequence in context: A114043 A001779 A053295 this_sequence A002664 A042609 A002941
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
Clark Kimberling (ck6(AT)evansville.edu), May 28 2000
|
|
|
Search completed in 0.002 seconds
|
