|
| |
|
|
A127234
|
|
a(n) = n! (sum(1..n-1))!.
|
|
2
| | |
|
|
|
OFFSET
| 1,2
|
|
|
COMMENTS
| Number of distinct n x n symmetrical matrices containing A000217(n+1) different elements which have that same trace.
|
|
|
MATHEMATICA
| Table[n! (Sum[x, {x, 1, n-1}])!, {n, 1, 10}]
|
|
|
CROSSREFS
| Cf. A127233, A127235.
Sequence in context: A004003 A060739 A134366 * A181555 A051459 A073581
Adjacent sequences: A127231 A127232 A127233 * A127235 A127236 A127237
|
|
|
KEYWORD
| nonn
|
|
|
AUTHOR
| Artur Jasinski (grafix(AT)csl.pl), Jan 09 2007, Jan 11 2007
|
|
|
EXTENSIONS
| Edited by Jason G. Wurtzel (j_seq(AT)wurtzel.com), Oct 08 2010
|
| |
|
|
