A069644 Let M_n be the n X n matrix with M_n(i,j)=1/(i+j+5); then a(n)=1/det(M_n).

7, 4032, 89812800, 56510213760000, 849349360466006400000, 275486641731816152769331200000, 1803836893978771496626439330581708800000, 227637647167687849779974528677945404209233920000000, 535361773557812808743387755473014006489270247399358464000000000

Offset

1,1

Links

Table of n, a(n) for n=1..9.

Mathematica

Table[Denominator[Det[Table[1/(i+j+5), {i, n}, {j, n}]]], {n, 10}] (* Harvey P. Dale, Dec 15 2018 *)

Prog

(PARI) for(n=1, 10, print1(1/matdet(matrix(n, n, i, j, 1/(i+j+5))), ", "))

Crossrefs

Sequence in context: A052496 A216935 A024100 * A203679 A145696 A361452

Adjacent sequences: A069641 A069642 A069643 * A069645 A069646 A069647

Keyword

easy,nonn

Author

Benoit Cloitre, Apr 21 2002

Extensions

More terms from Harvey P. Dale, Dec 15 2018

Status

approved