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A275076
Number of set partitions of [n] such that i-j is a multiple of nine for all i,j belonging to the same block.
2
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1280, 3200, 8000, 20000, 50000, 125000, 312500, 781250, 1953125, 5859375, 17578125, 52734375, 158203125, 474609375, 1423828125, 4271484375, 12814453125, 38443359375, 133270312500, 462003750000
OFFSET
0,11
LINKS
FORMULA
a(n) = Product_{i=0..8} A000110(floor((n+i)/9)).
CROSSREFS
Column k=9 of A275069.
Cf. A000110.
Sequence in context: A367654 A180212 A274862 * A275064 A238938 A103662
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Jul 15 2016
STATUS
approved