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A129125 Prune the tree structure defined in sequence A129129 yielding a new irregular table with shape sequence A027336. 0
1, 2, 3, 5, 6, 7, 10, 9, 11, 14, 15, 18, 13, 22, 21, 25, 30, 27, 17, 26, 33, 35, 42, 50, 45, 54, 19, 34, 39, 55, 66, 49, 70, 63, 75, 90, 81 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

A000041 begins 1 1 2 3 5 7 11 15 22 30 42 ... and when shifted 0 0 1 1 2 3 5 7 11 15 22 ... by subtraction yielding 1 1 1 2 3 4 6 8 11 15 20 ... shape seq A027736.

LINKS

Table of n, a(n) for n=0..36.

EXAMPLE

The original tree begins

1

2

3 4

5 6 8

7 10 9 12 16

11 14 15 20 18 24 32

multiplying by four yields

4

8

12 16

20 24 32

etc.

These are the values to be omitted leaving

1

2

3

5 6

7 10 9

11 14 15 18

etc.

CROSSREFS

Cf. A000041 A027336 A129129.

Sequence in context: A100693 A030159 A030161 * A259444 A071591 A089105

Adjacent sequences:  A129122 A129123 A129124 * A129126 A129127 A129128

KEYWORD

easy,more,nonn,tabf

AUTHOR

Alford Arnold, Apr 04 2007

STATUS

approved

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Last modified January 27 15:47 EST 2021. Contains 340467 sequences. (Running on oeis4.)