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A225609
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Recurrence a(n) = 2^n*a(n-1) + a(n-2) with a(0)=0, a(1)=1.
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2
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0, 1, 4, 33, 532, 17057, 1092180, 139816097, 35794013012, 18326674478241, 18766550459731796, 38433913668205196449, 157425329151518944386900, 1289628334843156860622681249, 21129270795495611155960953970516, 692363946716428521201685400328549537
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OFFSET
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0,3
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LINKS
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FORMULA
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a(n) ~ c * 2^(n^2/2 + n/2), where c = 0.52087674149344124670486211129137...
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MATHEMATICA
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RecurrenceTable[{a[n]==2^n*a[n-1]+a[n-2], a[0]==0, a[1]==1}, a, {n, 0, 15}]
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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