A369591 a(n) = number of Yamanouchi words over the alphabet {1, 2, 3} of length n that start with 3.

0, 0, 1, 2, 5, 14, 35, 90, 245, 644, 1716, 4707, 12727, 34683, 96174, 264784, 732785, 2051338, 5719684, 16007081, 45160093, 127106181, 358743903, 1018566177, 2887666445, 8204375034

Offset

1,4

Links

Table of n, a(n) for n=1..26.

Crossrefs

Column 3 in A369589.

Number of Yamanouchi words over the alphabet {1, 2, 3} is given by A001006, and by A217323 for the words containing 3.

Cf. A238728, A369590.

Sequence in context: A374699 A265226 A357835 * A299164 A131408 A137917

Adjacent sequences: A369588 A369589 A369590 * A369592 A369593 A369594

Keyword

nonn,more

Author

Max Alekseyev, Jan 26 2024

Status

approved