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Search: id:A074193
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| A074193 |
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Sum of determinants of 2nd order principal minors of powers of Tetramatrix ((1,1,0,0),(1,0,1,0),(1,0,0,1),(1,0,0,0)). |
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+0
2
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| 6, -1, -3, -1, 17, -16, -15, 13, 81, -127, -58, 175, 329, -885, -31, 1424, 833, -5543, 2181, 9233, -2298, -31025, 27893, 49495, -54879, -150416, 245697, 204965, -526887, -570895, 1801670, 407711, -3882303, -946397, 11542929, -3442672, -24121039, 10317745, 64959629, -56727711, -127083514
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OFFSET
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0,1
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FORMULA
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a(n)=-a(n-1)-2a(n-2)-2a(n-3)+2a(n-4)-a(n-5)+a(n-6), a(0)=6, a(1)=-1, a(2)=-3, a(3)=-1, a(4)=17, a(5)=-16. G.f.: (6+5x+8x^2+6x^3-4x^4+x^5)/(1+x+2x^2+2x^3-2x^4+x^5-x^6).
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MATHEMATICA
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CoefficientList[Series[(6+5*x+8*x^2+6*x^3-4*x^4+x^5)/(1+x+2*x^2+2*x^3-2*x^4+x^5-x^6), {x, 0, 50}], x]
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CROSSREFS
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Cf. A073817, A073937, A074081.
Sequence in context: A010136 A087256 A102419 this_sequence A074453 A069608 A086316
Adjacent sequences: A074190 A074191 A074192 this_sequence A074194 A074195 A074196
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KEYWORD
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easy,sign
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AUTHOR
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Mario Catalani (mario.catalani(AT)unito.it), Aug 20 2002
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