OFFSET
0,2
COMMENTS
LINKS
Indranil Ghosh, Table of n, a(n) for n = 0..501
Tanya Khovanova, Recursive Sequences
Index entries for linear recurrences with constant coefficients, signature (98, -1).
FORMULA
G.f.: 20x/(1-98x+x^2). [Philippe Deléham, Nov 18 2008]
EXAMPLE
0 and 20 are at the start of the sequence since m^2*(m^2-1)*2/3 (A072819) starts 0, 0, 8, 48, 160, 400, 840, 1568, ... and the only squares among these are 0 and 400 with square roots of 0 and 20.
CROSSREFS
KEYWORD
nonn
AUTHOR
Henry Bottomley, Jul 14 2002
STATUS
approved