OFFSET
1,1
COMMENTS
The sum of all elements of the sequence is the same as that of A263447.
REFERENCES
J. H. Conway, R. T. Curtis, S. P. Norton, R. A. Parker and R. A. Wilson, ATLAS of Finite Groups. Oxford Univ. Press, 1985 [for best online version see https://oeis.org/wiki/Welcome#Links_to_Other_Sites]. Page 238.
LINKS
Wikipedia, Sporadic group
EXAMPLE
The sporadic group Fi_23 is a subquotient of the sporadic groups Fi_23 (itself), Fi_24, the Baby Monster and the Monster, so a(21) = 4.
CROSSREFS
KEYWORD
nonn,fini,full
AUTHOR
STATUS
approved