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A028294 Number of stacks of n pikelets, distance 5 flips from a well-ordered stack. 2
1, 20, 281, 1357, 4281, 10666, 22825, 43891, 77937, 130096, 206681, 315305, 465001, 666342, 931561, 1274671, 1711585, 2260236, 2940697, 3775301, 4788761, 6008290, 7463721, 9187627, 11215441, 13585576, 16339545, 19522081, 23181257, 27368606 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,2

REFERENCES

Marc Paulhus (paulhus(AT)wanadoo.nl), Pikelets, Discrete Math, to be submitted.

LINKS

Table of n, a(n) for n=4..33.

FORMULA

n^5 - 65/6*n^4 + 173/6*n^3 + 148/3*n^2 - 862/3*n + 265.

CROSSREFS

Sequence in context: A021474 A017999 A012836 * A019040 A021204 A017953

Adjacent sequences:  A028291 A028292 A028293 * A028295 A028296 A028297

KEYWORD

nonn

AUTHOR

R. K. Guy

EXTENSIONS

More terms from David Wasserman, Jan 22 2005

STATUS

approved

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Last modified April 18 23:08 EDT 2014. Contains 240734 sequences.