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A028294 a(n) = n^5 - (65/6)*n^4 + (173/6)*n^3 + (148/3)*n^2 - (862/3)*n + 265. 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

COMMENTS

Old name was: "Number of stacks of n pikelets, distance 5 flips from a well-ordered stack".

LINKS

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

Index to sequences with linear recurrences with constant coefficients, signature (6,-15,20,-15,6,-1).

FORMULA

G.f.: x^4*(9*x^5-31*x^4-49*x^3+176*x^2+14*x+1) / (x-1)^6. - Colin Barker, Jun 04 2014

PROG

(PARI) Vec(x^4*(9*x^5-31*x^4-49*x^3+176*x^2+14*x+1)/(x-1)^6 + O(x^100)) \\ Colin Barker, Jun 04 2014

CROSSREFS

Sequence in context: A017999 A244653 A012836 * A019040 A021204 A017953

Adjacent sequences:  A028291 A028292 A028293 * A028295 A028296 A028297

KEYWORD

nonn,easy

AUTHOR

R. K. Guy

EXTENSIONS

More terms from David Wasserman, Jan 22 2005

Entry revised by N. J. A. Sloane, Jun 15 2014

STATUS

approved

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Last modified September 1 14:36 EDT 2014. Contains 246307 sequences.