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A214276
Number of compositions of n where the difference between largest and smallest parts equals 7 and adjacent parts are unequal.
2
0, 2, 1, 8, 12, 23, 56, 100, 196, 375, 724, 1334, 2508, 4678, 8593, 15871, 29048, 53125, 96779, 175921, 318915, 577064, 1042342, 1878814, 3382049, 6078454, 10910254, 19557912, 35020059, 62637612, 111921906, 199797264, 356348437, 635040273, 1130800760
OFFSET
8,2
LINKS
EXAMPLE
a(9) = 2: [8,1], [1,8].
a(10) = 1: [1,8,1].
a(11) = 8: [9,2], [8,2,1], [8,1,2], [2,9], [2,8,1], [2,1,8], [1,8,2], [1,2,8].
a(12) = 12: [8,3,1], [8,1,3], [8,1,2,1], [3,8,1], [3,1,8], [2,1,8,1], [1,8,3], [1,8,2,1], [1,8,1,2], [1,3,8], [1,2,8,1], [1,2,1,8].
CROSSREFS
Column k=7 of A214269.
Sequence in context: A214273 A214274 A214275 * A214277 A214278 A214279
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 09 2012
STATUS
approved