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Search: id:A008608
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A008608 Number of n X n upper triangular matrices A of nonnegative integers such that a_1i + a_2i + ... + a_{i-1,i} - a_ii - a_{i,i+1} - ... - a_in = -1. +0
1
1, 2, 7, 40, 357, 4820 (list; graph; listen)
OFFSET

1,2
CROSSREFS

Adjacent sequences: A008605 A008606 A008607 this_sequence A008609 A008610 A008611

Sequence in context: A132785 A064626 A137731 this_sequence A028441 A006455 A130715

KEYWORD

nonn

AUTHOR

Glenn P Tesler (gptesler(AT)euclid.ucsd.edu)

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Last modified October 9 14:06 EDT 2008. Contains 144831 sequences.

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