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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 (list; graph; refs; listen; history; text; internal format)
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, 273-279.

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

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Last modified November 22 18:55 EST 2019. Contains 329410 sequences. (Running on oeis4.)