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A171172 Triangle read by rows in which row n lists 3n-2 together with the first 2n-1 positive integers. 7
1, 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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..92.

EXAMPLE

Triangle begins:

1,1,

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,

CROSSREFS

Cf. A016777, A172310, A171173, A171174, A171175, A171176, A171177, A171178.

Sequence in context: A055182 A298919 A190649 * A084454 A127812 A072033

Adjacent sequences:  A171169 A171170 A171171 * A171173 A171174 A171175

KEYWORD

easy,nonn,tabf

AUTHOR

Omar E. Pol, Feb 23 2010

STATUS

approved

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Last modified November 19 11:09 EST 2019. Contains 329319 sequences. (Running on oeis4.)