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A083484 Square root of product of terms in row n of A083486. 3
1, 4, 12, 60, 420, 2520, 27720, 720720, 720720, 24504480, 465585120, 2793510720, 64250746560, 642507465600, 1927522396800, 111796299014400, 3465685269446400, 20794111616678400, 727793906583744000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..19.

MAPLE

A083486 := proc(n, m) local fs, k, resu, extr ; if m < n then n+m-1; else fs := ifactors(mul( A083486(n, k), k=1..n-1))[2] ; resu := mul( op(1, op(k, fs))^(op(2, op(k, fs)) mod 2), k=1..nops(fs)) ; extr := 1 ; while extr^2*resu <= A083486(n, n-1) do extr := extr+1 ; od ; RETURN(resu*extr^2) ; fi ; end: A083484 := proc(n) sqrt(mul(A083486(n, m), m=1..n)) ; end: for n from 1 to 25 do printf("%a ", A083484(n)) ; od ; - R. J. Mathar, Apr 05 2007

CROSSREFS

Cf. A083485, A083486.

Sequence in context: A084709 A057394 A054719 * A097250 A088860 A188328

Adjacent sequences:  A083481 A083482 A083483 * A083485 A083486 A083487

KEYWORD

nonn

AUTHOR

Amarnath Murthy and Meenakshi Srikanth (amarnath_murthy(AT)yahoo.com), May 03 2003

EXTENSIONS

Corrected and extended by R. J. Mathar, Apr 05 2007

STATUS

approved

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Last modified April 17 20:01 EDT 2014. Contains 240655 sequences.