

A171173


Triangle read by rows in which row n lists A033627(n) together with the first 2n1 positive integers.


10



2, 1, 4, 1, 2, 3, 7, 1, 2, 3, 4, 5, 10, 1, 2, 3, 4, 5, 6, 7, 13, 1, 2, 3, 4, 5, 6, 7, 8, 9, 16, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 19, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 22, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 25, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 28, 1
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OFFSET

1,1


COMMENTS

The same as A171172 except the initial term.
Also, a(n) is the length of each component of the nth Ltoothpick added to the structure of A171165.
See also A171175, a permutation of the natural numbers.


LINKS

Harvey P. Dale, Table of n, a(n) for n = 1..10000
N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS
Index entries for sequences related to toothpick sequences


EXAMPLE

Triangle begins:
2,1,
4,1,2,3,
7,1,2,3,4,5,
10,1,2,3,4,5,6,7,
13,1,2,3,4,5,6,7,8,9,
16,1,2,3,4,5,6,7,8,9,10,11,
19,1,2,3,4,5,6,7,8,9,10,11,12,13,
22,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,
25,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,


MATHEMATICA

Join[{2, 1}, Flatten[Table[Flatten[{3n+1, Range[2n+1]}], {n, 10}]]] (* Harvey P. Dale, Nov 24 2011 *)


CROSSREFS

Cf. A000027, A033627, A172310, A171164, A161165, A161166, A171172, A171174, A171175, A171176, A171177, A171178.
Sequence in context: A179289 A083414 A171174 * A268671 A163618 A275392
Adjacent sequences: A171170 A171171 A171172 * A171174 A171175 A171176


KEYWORD

easy,nonn,tabf


AUTHOR

Omar E. Pol, Feb 23 2010


STATUS

approved



