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A088945 a(n) =60*sum(1<=u<=v<=w<=m,u^2*v^2/w). 1
0, 60, 690, 3630, 13035, 37059, 89839, 193879, 382834, 704694, 1225368, 2032668, 3240693, 4994613, 7475853, 10907677, 15561172, 21761632, 29895342, 40416762, 53856111, 70827351, 92036571, 118290771, 150507046, 189722170, 237102580 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Always an integer. Can be expressed as a polynomial with rational coefficients of degree 6.

LINKS

Table of n, a(n) for n=0..26.

Index entries for linear recurrences with constant coefficients, signature (7,-21,35,-35,21,-7,1).

FORMULA

n*(200*n^5+1752*n^4+5705*n^3+8370*n^2+5075*n+498)/360. - Vladeta Jovovic, Oct 27 2003

G.f.: -x*(x^5-6*x^4+15*x^3+60*x^2+270*x+60) / (x-1)^7. - Colin Barker, Jun 19 2013

CROSSREFS

Cf. A088941, A088942, A088943, A088944.

Sequence in context: A223242 A244837 A268624 * A269189 A136008 A000555

Adjacent sequences:  A088942 A088943 A088944 * A088946 A088947 A088948

KEYWORD

nonn,easy

AUTHOR

Benoit Cloitre, Oct 25 2003

STATUS

approved

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Last modified August 21 23:01 EDT 2019. Contains 326169 sequences. (Running on oeis4.)