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0, 3, 14, 63, 324, 1955, 13698, 109599, 986408, 9864099, 108505110, 1302061343, 16926797484, 236975164803, 3554627472074, 56874039553215, 966858672404688, 17403456103284419, 330665665962403998, 6613313319248079999, 138879579704209680020, 3055350753492612960483
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Number of operations of addition and multiplication needed to evaluate a determinant of order n by cofactor expansion.
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REFERENCES
| C. Dubbs and D. Siegel, Computing determinants, College Math. J., 18 (1987), 48-49.
A. R. Pargeter, The vanishing coffee morning, Math. Gaz., 76 (1992), 386-387.
P. G. Sawtelle, The ubiquitous e, Math. Mag., 49 (1976), 244-245. [From N. J. A. Sloane (njas(AT)research.att.com), Jan 29 2009]
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CROSSREFS
| Cf. A000522, A007526. Equals A033312 + A038156.
Cf. A001339.
Sequence in context: A091701 A151237 A151238 * A058139 A101476 A060801
Adjacent sequences: A026240 A026241 A026242 * A026244 A026245 A026246
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), based on a message from a correspondent who wishes to remain anonymous, Dec 21 2003
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