OFFSET
0,2
COMMENTS
Occurs in the enumerations of inflations of code words babxxxdc [Albert et al. Sec 5.5.1]
LINKS
M. H. Albert, M. D. Atkinson, R. Brignall, The enumeration of three pattern classes using monotone grid classes, El. J. Combinat. 19 (3) (2012) P20.
Harry Crane, Left-right arrangements, set partitions, and pattern avoidance, Australasian Journal of Combinatorics, 61(1) (2015), 57-72.
Santiago López de Medrano, On the genera of moment-angle manifolds associated to dual-neighborly polytopes, combinatorial formulas and sequences, arXiv:2003.07508 [math.GT], 2020.
Index entries for linear recurrences with constant coefficients, signature (11,-50,120,-160,112,-32).
FORMULA
a(n) = 2^n*(24+18*n+23*n^2+6*n^3+n^4)/12-1.
a(0)=1, a(1)=11, a(2)=71, a(3)=351, a(4)=1471, a(5)=5503, a(n)=11*a(n-1)- 50*a(n-2)+ 120*a(n-3)-160*a(n-4)+112*a(n-5)-32*a(n-6). - Harvey P. Dale, Mar 02 2015
MATHEMATICA
CoefficientList[Series[1/((1-2x)^5(1-x)), {x, 0, 30}], x] (* or *) LinearRecurrence[ {11, -50, 120, -160, 112, -32}, {1, 11, 71, 351, 1471, 5503}, 30] (* Harvey P. Dale, Mar 02 2015 *)
PROG
(PARI) Vec(1/((1-2*x)^5*(1-x))+ O(x^30)) \\ Michel Marcus, Feb 12 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
R. J. Mathar, Feb 07 2013
STATUS
approved