

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



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.


KEYWORD

easy,nonn,tabf


AUTHOR



STATUS

approved



