A106360 Number of compositions of n with exactly 4 adjacent equal parts.

1, 0, 2, 9, 14, 33, 92, 189, 411, 926, 2016, 4219, 8935, 18805, 38808, 79928, 163963, 332676, 672036, 1352412, 2705019, 5385960, 10684650, 21105565, 41533076, 81467400, 159263257, 310372453, 603149241, 1168863180, 2259230907, 4356082977, 8379339160, 16082321525

Offset

5,3

Links

Alois P. Heinz, Table of n, a(n) for n = 5..1250

A. Knopfmacher and H. Prodinger, On Carlitz compositions, European Journal of Combinatorics, Vol. 19, 1998, pp. 579-589.

Crossrefs

Column 4 of A106356. Cf. A003242.

Sequence in context: A366938 A254608 A324275 * A024470 A024472 A279089

Adjacent sequences: A106357 A106358 A106359 * A106361 A106362 A106363

Keyword

nonn

Author

Christian G. Bower, Apr 29 2005

Extensions

Replaced broken link, Vaclav Kotesovec, May 01 2014

Status

approved