A104008 Area of (m,m+1,m+1)-integer triangle for m in A103975.

120, 25080, 4890480, 949077360, 184120982760, 35718589344360, 6929223155685600, 1344233586759971040, 260774386791383159640, 50588886806491889178840, 9813983266108156439587920, 1903862164738670605583434320, 369339445976042880280120411080

Offset

1,1

Links

Table of n, a(n) for n=1..13.

Index entries for linear recurrences with constant coefficients, signature (208, -2718, 208, -1).

Formula

a(n) = (m/4)*sqrt((3*m+2)*(m+2)), where m=A103975(n).

G.f.: 120*x*(x+1) / ((x^2-194*x+1)*(x^2-14*x+1)). - Colin Barker, Apr 10 2013

Mathematica

LinearRecurrence[{208, -2718, 208, -1}, {120, 25080, 4890480, 949077360}, 20] (* Harvey P. Dale, Mar 06 2017 *)

Crossrefs

Cf. A103975.

Sequence in context: A264957 A270604 A151604 * A278726 A227667 A054778

Adjacent sequences: A104005 A104006 A104007 * A104009 A104010 A104011

Keyword

nonn,easy

Author

Zak Seidov, Feb 24 2005

Extensions

More terms from Max Alekseyev, May 31 2007

More terms from Colin Barker, Apr 10 2013

Status

approved