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A076175 Denominator of sum( i+j+k = n, (i*j)/k) i,j,k >=1. 1
1, 1, 1, 2, 3, 12, 15, 30, 21, 168, 126, 1260, 990, 792, 1287, 18018, 5005, 80080, 68068, 58344, 50388, 201552, 176358, 3879876, 3432198, 27457584, 24515700, 637408200, 573667380, 16062686640, 29113619535, 26466926850, 24131609775 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..33.

PROG

(PARI) a(n)=denominator(sum(i=1, n, sum(j=1, n, sum(k=1, n, if(n-i-j-k, 0, 1)*i*j/k))))

CROSSREFS

Cf. A076174.

Sequence in context: A173903 A154785 A090512 * A289870 A067780 A290168

Adjacent sequences:  A076172 A076173 A076174 * A076176 A076177 A076178

KEYWORD

frac,nonn

AUTHOR

Benoit Cloitre, Nov 01 2002

STATUS

approved

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Last modified January 19 01:11 EST 2021. Contains 340262 sequences. (Running on oeis4.)