A214278 Number of compositions of n where the difference between largest and smallest parts equals 9 and adjacent parts are unequal.

0, 2, 1, 8, 12, 23, 56, 100, 196, 380, 734, 1360, 2583, 4831, 8933, 16629, 30627, 56359, 103401, 189241, 345386, 629284, 1144379, 2076985, 3764633, 6812624, 12312124, 22223544, 40067505, 72159773, 129826552, 233358096, 419077220, 751979608, 1348268372

Offset

10,2

Links

Alois P. Heinz, Table of n, a(n) for n = 10..2000

Example

a(11) = 2: [10,1], [1,10].
a(12) = 1: [1,10,1].
a(13) = 8: [2,11], [2,10,1], [2,1,10], [11,2], [10,2,1], [10,1,2], [1,2,10], [1,10,2].
a(14) = 12: [3,10,1], [3,1,10], [2,1,10,1], [10,3,1], [10,1,3], [10,1,2,1], [1,3,10], [1,2,10,1], [1,2,1,10], [1,10,3], [1,10,2,1], [1,10,1,2].

Crossrefs

Column k=9 of A214269.

Sequence in context: A214275 A214276 A214277 * A214279 A360608 A151501

Adjacent sequences: A214275 A214276 A214277 * A214279 A214280 A214281

Keyword

nonn

Author

Alois P. Heinz, Jul 09 2012

Status

approved