OFFSET
1,2
COMMENTS
Signed values are only relevant for the explicit formula.
Refers to A057102, which had an incorrect description and has been replaced by A256418. As a result the present sequence should be re-checked. - N. J. A. Sloane, Apr 06 2015
LINKS
Eric Weisstein's World of Mathematics, Congruum Problem.
EXAMPLE
a(1)=T(2,1)=1^2+2*2*1-2^2=1
CROSSREFS
KEYWORD
sign,tabl
AUTHOR
Henry Bottomley, Aug 02 2000
STATUS
approved