OFFSET
0,2
LINKS
Andrei Asinowski and Toufik Mansour, Separable d-Permutations and Guillotine Partitions, arXiv:0803.3414 [math.CO], 2008.
Andrei Asinowski and Toufik Mansour, Separable d-Permutations and Guillotine Partitions, Annals of Combinatorics 14 (1) pp.17-43 Springer, 2010.
Index entries for linear recurrences with constant coefficients, signature (9,-32,56,-48,16).
FORMULA
Andrei Asinowski and Toufik Mansour give a g.f.
G.f. -(-7*x+20*x^2-26*x^3+12*x^4+2*x^5+1)/((x-1)*(2*x-1)^4). - R. J. Mathar, Jan 04 2013
a(n) = 2+(n-1)*(n^2+n+42)*2^(n-4)/3 for n>0. - R. J. Mathar, Jan 30 2013 (see Maple section).
MAPLE
A220874 := proc(n)
if n = 0 then
1;
else
2+(n-1)*(n^2+n+42)*2^(n-4)/3 ;
end if;
end proc: # R. J. Mathar, Jan 30 2013
MATHEMATICA
a[0] = 1; a[n_] := 2 + (n - 1)*(n^2 + n + 42)*2^(n - 4)/3;
Table[a[n], {n, 0, 28}] (* Jean-François Alcover, Dec 01 2017, after R. J. Mathar *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Dec 27 2012
STATUS
approved