1,2
a(5) = 5^10.
a(3) = -8505 =
|..1...5..15|
|.35..70.126|
|210.330.495|.
a(4) = 0 because of the singular matrix 0 =
|.1...3...6..10|
|15..21..28..36|
|45..55..66..78|
|91.105.120.136|.
Cf. A000217, A119493.
Sequence in context: A123810 A146198 A159376 this_sequence A123381 A159680 A159390
Adjacent sequences: A119522 A119523 A119524 this_sequence A119526 A119527 A119528
easy,sign
Jonathan Vos Post (jvospost3(AT)gmail.com), May 27 2006
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