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A003827 'Core' alternating sign n X n matrices, i.e. those that are not 'blown up' from a smaller matrix by inserting row i, column j with a_ij = 1 and all other entries in that row and column equal to 0. +0
4
1, 2, 59, 1882, 24952 (list; graph; listen)
OFFSET

3,2

REFERENCES

R. K. Guy, Unsolved Problems in Number Theory, D1.

CROSSREFS

Cf. A051055, A005130.

Sequence in context: A138982 A142666 A051055 this_sequence A139190 A050283 A096758

Adjacent sequences: A003824 A003825 A003826 this_sequence A003828 A003829 A003830

KEYWORD

nonn,easy

AUTHOR

Christine.Bessenrodt(AT)Mathematik.Uni-Magdeburg.DE

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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