A102416 Triangle read by rows: the numbers B_2(n,k) from the Harju and Nowotka paper.

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

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.

Links

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

T. Harju and D. Nowotka, Counting bordered and primitive words with a fixed weight, TUCS Technical Report, No 630, Turku, November 2004.

T. Harju and D. Nowotka, Counting bordered and primitive words with a fixed weight, Theoret. Comput. Sci. 340 (2005), no. 2, 273-279.

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: A227293 A331391 A359442 * A333595 A227509 A279094

Adjacent sequences: A102413 A102414 A102415 * A102417 A102418 A102419

Keyword

nonn,tabf

Author

N. J. A. Sloane, Mar 17 2005

Status

approved