

A167413


Irregular array with the first differences of row A167384(n,.) in row n.


1



2, 2, 1, 3, 1, 3, 1, 3, 1, 3, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 4, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 5, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6, 1, 1, 1, 1, 6
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

0,1


COMMENTS

The left column has 2 two's, 4 three's, 6 four's,... ,2*k2 k's.
Entries in the remaining columns are all 1.
If one looks at the flattened sequence (2), (2), (1,3), (1,3), (1,3),.. in blocks of 1, 1, 2, 2, 2,.. , A000194(k) terms, the sum of entries in the subsequence in block number k is A001670(k).


LINKS

Table of n, a(n) for n=0..104.


EXAMPLE

2;
2, 1;
3, 1;
3, 1;
3, 1;
3, 1, 1;
4, 1, 1;
4, 1, 1;
4, 1, 1;
4, 1, 1;
4, 1, 1;
4, 1, 1, 1;
5, 1, 1, 1;
5, 1, 1, 1;
5, 1, 1, 1;
5, 1, 1, 1;
5,...


CROSSREFS

Cf. A167381.
Sequence in context: A297626 A206441 A175245 * A340985 A259176 A237591
Adjacent sequences: A167410 A167411 A167412 * A167414 A167415 A167416


KEYWORD

nonn,tabf


AUTHOR

Paul Curtz, Nov 03 2009


STATUS

approved



