A214275 Number of compositions of n where the difference between largest and smallest parts equals 6 and adjacent parts are unequal.

0, 2, 1, 8, 12, 23, 56, 100, 191, 370, 703, 1280, 2409, 4437, 8076, 14821, 26895, 48760, 88102, 158831, 285490, 512395, 917768, 1640448, 2928758, 5220037, 9291968, 16519618, 29335963, 52038382, 92218708, 163272053, 288813272, 510469514, 901536574, 1591035005

Offset

7,2

Links

Alois P. Heinz, Table of n, a(n) for n = 7..2000

Example

a(8) = 2: [7,1], [1,7].
a(9) = 1: [1,7,1].
a(10) = 8: [8,2], [7,2,1], [7,1,2], [2,8], [2,7,1], [2,1,7], [1,7,2], [1,2,7].
a(11) = 12: [7,3,1], [7,1,3], [7,1,2,1], [3,7,1], [3,1,7], [2,1,7,1], [1,7,3], [1,7,2,1], [1,7,1,2], [1,3,7], [1,2,7,1], [1,2,1,7].

Crossrefs

Column k=6 of A214269.

Sequence in context: A214272 A214273 A214274 * A214276 A214277 A214278

Adjacent sequences: A214272 A214273 A214274 * A214276 A214277 A214278

Keyword

nonn

Author

Alois P. Heinz, Jul 09 2012

Status

approved