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A159786 Total area of all squares and rectangles after n-th stage in the toothpick structure of A139250, assuming the toothpicks have length 2. 12

%I

%S 0,0,0,4,8,8,12,32,48,48,52,64,72,76,104,176,224,224,228,240,248,252,

%T 280,336,368,372,392,424,444,480,608,864,960,960,964,976,984,988,1016,

%U 1072,1104,1108,1128,1160,1180,1216,1344,1536,1632,1636,1656

%N Total area of all squares and rectangles after n-th stage in the toothpick structure of A139250, assuming the toothpicks have length 2.

%C Note that if n > 1 is a power of 2 then a(n) = n^2 - 2n.

%H David Applegate, Omar E. Pol and N. J. A. Sloane, <a href="http://neilsloane.com/doc/tooth.pdf">The Toothpick Sequence and Other Sequences from Cellular Automata</a>, Congressus Numerantium, Vol. 206 (2010), 157-191. [There is a typo in Theorem 6: (13) should read u(n) = 4.3^(wt(n-1)-1) for n >= 2.]

%H N. J. A. Sloane, <a href="/wiki/Catalog_of_Toothpick_and_CA_Sequences_in_OEIS">Catalog of Toothpick and Cellular Automata Sequences in the OEIS</a>

%F a(2^k) = A211012(k). - _Omar E. Pol_, Sep 25 2012

%Y Cf. A139250, A139251, A159787, A159788, A159789, A159796.

%K nonn

%O 0,4

%A _Omar E. Pol_, Apr 28 2009

%E More terms from _Omar E. Pol_, Sep 25 2012

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Last modified March 20 07:42 EDT 2019. Contains 321345 sequences. (Running on oeis4.)