

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
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OFFSET

4,2


COMMENTS

Old name was: "Number of stacks of n pikelets, distance 5 flips from a wellordered 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^531*x^449*x^3+176*x^2+14*x+1) / (x1)^6.  Colin Barker, Jun 04 2014


PROG

(PARI) Vec(x^4*(9*x^531*x^449*x^3+176*x^2+14*x+1)/(x1)^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



