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Search: id:A134978
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A134978 Number of 2 X 2 singular integer matrices with entries from {2,...,n}. +0
1
0, 1, 6, 15, 28, 53, 74, 111, 152, 209, 246, 339, 384, 473, 582, 695, 756, 917, 986, 1175, 1340, 1493, 1578, 1855, 2008, 2193, 2398, 2683, 2792, 3185, 3302, 3603, 3880, 4129, 4446, 4943, 5084, 5365, 5698, 6231, 6388, 6973, 7138, 7615, 8172, 8517, 8698, 9431 (list; graph; listen)
OFFSET

1,3

CROSSREFS

Cf. A134506.

Sequence in context: A096892 A000384 A164000 this_sequence A115742 A026102 A144519

Adjacent sequences: A134975 A134976 A134977 this_sequence A134979 A134980 A134981

KEYWORD

nice,nonn

AUTHOR

Graziano Aglietti (mg5055(AT)mclink.it), Feb 04 2008

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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