login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A259435 a(n) = 2*(n-1)^6*(n+1)^2*(n^2+10*n+1). 2
2, 0, 450, 81920, 2077650, 22413312, 148531250, 716636160, 2763575010, 9017753600, 25850353122, 66816000000, 158678718770, 351151718400, 731985584850, 1449526034432, 2745436781250, 5000952545280, 8800799033090, 15019798118400, 24938174692242, 40392704000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

This appears as the function alpha(n) in Delest, related to bar/bat theory; see section 3.

LINKS

Table of n, a(n) for n=0..21.

M. P. Delest, Generating functions for column-convex polyominoes, J. Combin. Theory Ser. A 48 (1988), no. 1, pp. 12-31. See expression E in Theorem 16 page 29.

Index entries for linear recurrences with constant coefficients, signature (11,-55,165,-330,462,-462,330,-165,55,-11,1).

FORMULA

G.f.: 2*(1 -11*x + 280*x^2 + 38320*x^3 + 600970*x^4 + 1994794*x^5 + 1444096*x^6 - 231320*x^7 - 207395*x^8 - 10935*x^9)/(1-x)^11.

a(n) = 11*a(n-1) - 55*a(n-2) + 165*a(n-3) - 330*a(n-4) + 462*a(n-5) - 462*a(n-6) + 330*a(n-7) - 165*a(n-8) + 55*a(n-9) - 11*a(n-10) + a(n-11).

MAPLE

A259435:=n->2*(n-1)^6*(n+1)^2*(n^2+10*n+1): seq(A259435(n), n=0..30); # Wesley Ivan Hurt, Jun 29 2015

MATHEMATICA

Table[2 (n - 1)^6 (n + 1)^2 (n^2 + 10 n + 1), {n, 0, 30}]

PROG

(MAGMA) [2*(n-1)^6*(n+1)^2*(n^2+10*n+1): n in [0..30]];

(PARI) a(n)=2*(n-1)^6*(n+1)^2*(n^2+10*n+1) \\ Charles R Greathouse IV, Jun 29 2015

(Sage) [2*(n-1)^6*(n+1)^2*(n^2+10*n+1) for n in (0..30)] # Bruno Berselli, Jun 30 2015

CROSSREFS

Cf. A001105, A005435, A259364, A259395.

Sequence in context: A012452 A013417 A013418 * A114630 A114632 A036108

Adjacent sequences:  A259432 A259433 A259434 * A259436 A259437 A259438

KEYWORD

nonn,easy

AUTHOR

Vincenzo Librandi, Jun 27 2015

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 29 16:58 EST 2020. Contains 331347 sequences. (Running on oeis4.)