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13, 58, 244, 1000, 4048, 16288, 65344, 261760, 1047808, 4192768, 16774144, 67102720, 268423168, 1073717248, 4294918144, 17179770880, 68719280128, 274877513728, 1099510841344, 4398044938240, 17592182898688, 70368737886208
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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LINKS
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FORMULA
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a(n) = 2^(2n+2)-3*2^(n-1).
a(n+1) = 4*a(n)+3*2^n.
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MATHEMATICA
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Table[2^(2n+2)-3*2^(n-1), {n, 30}] (* or *) nxt[{n_, a_}]:={n+1, 4a+3*2^n}; NestList[nxt, {1, 13}, 30][[All, 2]] (* Harvey P. Dale, Nov 15 2021 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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