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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
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 A027336.
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;
...
These are the values to be omitted, leaving
1;
2;
3;
5, 6;
7, 10, 9;
11, 14, 15, 18;
...
CROSSREFS
KEYWORD
more,nonn,tabf
AUTHOR
Alford Arnold, Apr 04 2007
STATUS
approved