A056225 Hankel transform of number of divisors sequence (A000005).

1, -2, 3, 3, -7, -3, 16, 3, -27, -27, 51, -131, -198, 153, 680, 87, -144, 1728, 837, -612, -1209, 8323, 7692, -18603, 19731, 90355, 53811, -11862, -26325, -4617, 43011, -146043, -285804, 4338927, -10634576, -9106743, -4841163, 25073595, -39991893, -78120734, -38434140, 71394066, -79624323, 103828878

Offset

1,2

Links

Robert Israel, Table of n, a(n) for n = 1..1000

Maple

f:= (i, j) -> numtheory:-tau(i+j-1): A056225:= n -> LinearAlgebra:-Determinant(Matrix(n, n, f)):
map(A056225, [$1..100]); # Robert Israel, Dec 08 2017

Mathematica

f[n_] := Det@Table[DivisorSigma[0, (i + j - 1)], {i, n}, {j, n}]; Array[f, 44] (* Robert G. Wilson v, Dec 08 2017 *)

Crossrefs

See A001906 for definition of Hankel transform.

Sequence in context: A209494 A082910 A023646 * A343390 A105437 A323952

Adjacent sequences: A056222 A056223 A056224 * A056226 A056227 A056228

Keyword

sign,easy

Author

N. J. A. Sloane, Aug 06 2000

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Apr 05 2003

More terms from Robert Israel, Dec 08 2017

Status

approved