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

Author

Alois P. Heinz, Jul 09 2012

Keywords

• nonn

Examples

			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].
		

Links

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

Crossrefs

Column k=9 of A214269.