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 A171170 Corner sequence (starting each round in the first quadrant). 1
 1, 2, 3, 4, 4, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 1, 4, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 1, 3, 4, 1, 4, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 3, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3, 4, 3, 4, 1, 4, 1, 2, 4, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 1, 3, 4, 1, 4, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 3, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 2, 3 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See A161411, which is the main entry for this sequence. See also A171171 for another version. LINKS David Applegate, Omar E. Pol and N. J. A. Sloane, The Toothpick Sequence and Other Sequences from Cellular Automata, 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.] N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS EXAMPLE ================ .......41....... .......32....... ================ ......4141...... ......3..2...... ......4..1...... ......3232...... ================ .....41..41..... .....3....2..... ................ ................ .....4....1..... .....32..32..... ================ ....41414141.... ....3..23..2.... ....4......1.... ....32....32.... ....41....41.... ....3......2.... ....4..14..1.... ....32323232.... ================ ...41......41... ...3........2... ................ ................ ................ ................ ................ ................ ................ ...4........1... ...32......32... ================ And so on. Triangle begins: 1,2,3,4; 4,1,2, 1,2,3, 2,3,4, 3,4,1; 4,1,2, 1,2,3, 2,3,4, 3,4,1; 3,4,1,4,1,2,1,2,3, 4,1,2,1,2,3,2,3,4, 1,2,3,2,3,4,3,4,1, 2,3,4,3,4,1,4,1,2; 4,1,2, 1,2,3, 2,3,4, 3,4,1; 3,4,1,4,1,2,1,2,3, 4,1,2,1,2,3,2,3,4, 1,2,3,2,3,4,3,4,1, 2,3,4,3,4,1,4,1,2; Contribution from Omar E. Pol, Dec 09 2009: (Start) Illustration for n = 1..148 ================ .41..41..41..41. .341412..341412. ..3412....3412.. ..434141414121.. .43234123412321. .32.43414121.32. ....32341232.... ....41432141.... .41.34323212.41. .34143214321412. ..343232323212.. ..4321....4321.. .432321..432321. .32..32..32..32. ================ (End) CROSSREFS Cf. A139250, A139251, A160410, A161411, A171171. Sequence in context: A134581 A099587 A172160 * A256913 A160386 A174015 Adjacent sequences:  A171167 A171168 A171169 * A171171 A171172 A171173 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Dec 04 2009 STATUS approved

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Last modified January 21 13:56 EST 2019. Contains 319350 sequences. (Running on oeis4.)