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A246335 Second bisection of A246333. 7
1, 5, 9, 21, 25, 37, 57, 85, 89, 101, 121, 165, 169, 213, 217, 317, 321, 333, 353, 397, 401, 461, 481, 637, 593, 733, 689, 877, 801, 981, 921, 1157, 1185, 1197, 1217, 1261, 1265, 1325, 1345, 1501, 1457, 1613, 1585, 1829, 1721, 2037, 1913, 2381, 2145, 2477, 2409, 2685 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

a(2^k-1) begins 1,5,21,85, which is (4^k-1)/3, but a(15) = 317 not 341, breaking the pattern.

LINKS

Table of n, a(n) for n=0..51.

N. J. A. Sloane, Illustration of first 24 generations of A246333

N. J. A. Sloane, Illustration of a(6) = 57 (Note that this is a different configuration of 57 cells from that in generation 6 of A169707, although the configurations of 37 cells at generation 5 are the same up to rotation.)

N. J. A. Sloane, On the Number of ON Cells in Cellular Automata, arXiv:1503.01168, 2015

Index entries for sequences related to cellular automata

MATHEMATICA

max = 100; (Partition[Total[Flatten[#]]& /@ CellularAutomaton[{493, {2, {{0, 2, 0}, {2, 1, 2}, {0, 2, 0}}}, {1, 1}}, {{{1}}, 0}, max], 2] /. {a_, b_} -> {a, (max + 1 - Mod[max, 2])^2 - b} )[[All, 2]] (* Jean-Fran├žois Alcover, Oct 03 2018 *)

CROSSREFS

Cf. A246333, A246334, A247001. Similar to but different from A169707.

Sequence in context: A256260 A256250 A256138 * A255264 A321170 A147407

Adjacent sequences:  A246332 A246333 A246334 * A246336 A246337 A246338

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Aug 30 2014

STATUS

approved

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Last modified January 20 12:32 EST 2019. Contains 319330 sequences. (Running on oeis4.)