

A102416


Triangle read by rows: the numbers B_2(n,k) from the Harju and Nowotka paper.


3



2, 2, 4, 2, 16, 4, 28, 6, 4, 56, 14, 8, 108, 30, 16, 6, 216, 60, 28, 12, 424, 124, 60, 24, 12, 848, 248, 128, 48, 24, 1684, 492, 244, 90, 48, 20, 3368, 984, 512, 186, 96, 40, 6712, 1960, 1000, 384, 192, 80, 40, 13424, 3920, 2032, 756, 372, 160, 80, 26808
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OFFSET

0,1


COMMENTS

It took a while to get these numbers and I cannot find the paper now, so do not have a more precise description.  N. J. A. Sloane.


REFERENCES

T. Harju and D. Nowotka, Counting bordered and primitive words with a fixed weight, Preprint, Oct 28, 2004
T. Harju and D. Nowotka, Counting bordered and primitive words with a fixed weight, Theoret. Comput. Sci. 340 (2005), no. 2, 273279.


LINKS

Table of n, a(n) for n=0..56.


EXAMPLE

Triangle begins:
2
2
4, 2
16, 4
28, 6, 4
56, 14, 8
108, 30, 16, 6
216, 60, 28, 12
424, 124, 60, 24, 12
848, 248, 128, 48, 24
1684, 492, 244, 90, 48, 20


CROSSREFS

Cf. A102864, A103179.
Sequence in context: A126984 A159749 A227293 * A227509 A279094 A299148
Adjacent sequences: A102413 A102414 A102415 * A102417 A102418 A102419


KEYWORD

nonn,tabf


AUTHOR

N. J. A. Sloane, Mar 17 2005


STATUS

approved



