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 A171171 Corner sequence (starting each round with the corner (SE): 1,2,3). 1
 1, 2, 3, 4, 1, 2, 3, 2, 3, 4, 3, 4, 1, 4, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 1, 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, 3, 4, 1, 4, 1, 2, 1, 2, 3, 4, 1, 2, 1, 2, 3, 2, 3, 4, 3, 4, 1, 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, 3, 4, 1, 4, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS See A161411, which is the main entry for this sequence. See also A171170 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; 1,2,3, 2,3,4, 3,4,1, 4,1,2; 1,2,3, 2,3,4, 3,4,1, 4,1,2; 1,2,3,2,3,4,1,2,3, 2,3,4,3,4,1,2,3,4, 3,4,1,4,1,2,3,4,1, 4,1,2,1,2,3,4,1,2; 1,2,3, 2,3,4, 3,4,1, 4,1,2; 1,2,3,2,3,4,1,2,3, 2,3,4,3,4,1,2,3,4, 3,4,1,4,1,2,3,4,1, 4,1,2,1,2,3,4,1,2; 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, A171170. Sequence in context: A322424 A309198 A256914 * A159957 A053840 A010883 Adjacent sequences:  A171168 A171169 A171170 * A171172 A171173 A171174 KEYWORD nonn,tabf AUTHOR Omar E. Pol, Dec 04 2009 STATUS approved

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Last modified December 16 00:33 EST 2019. Contains 330013 sequences. (Running on oeis4.)