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A189741
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a(1)=4, a(2)=2, a(n) = 4*a(n-1) + 2*a(n-2).
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14
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4, 2, 16, 68, 304, 1352, 6016, 26768, 119104, 529952, 2358016, 10491968, 46683904, 207719552, 924246016, 4112423168, 18298184704, 81417585152, 362266710016, 1611902010368, 7172141461504, 31912369866752, 141993762390016, 631799789293568, 2811186681954304
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OFFSET
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1,1
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LINKS
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FORMULA
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MATHEMATICA
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LinearRecurrence[{4, 2}, {4, 2}, 40]
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PROG
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(Maxima) a[1]:4$ a[2]:2$ a[n]:=4*a[n-1]+2*a[n-2]$ makelist(a[n], n, 1, 25); /* Bruno Berselli, May 24 2011 */
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CROSSREFS
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Cf. A000045, A000079, A105476, A159612, A080040, A135522, A103435, A189732, A189734, A189735, A189736, A189737, A189738, A189739, A189742, A189743, A189744, A189745, A189746, A189747, A189748, A189749.
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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