OFFSET
0,4
LINKS
Jan Snellman and Michael Paulsen, Enumeration of Concave Integer Partitions, J. Integer Seq., Vol. 7 (2004), Article 04.1.3.
Index entries for linear recurrences with constant coefficients, signature (1,0,1,-1,0,1,-1,0,-1,1).
FORMULA
G.f.: 1/((1-x)*(1-x^3)*(1-x^6)).
Sum_{n>=0} 1/a(n) = Pi^2/2 + 3. - Amiram Eldar, Feb 14 2023
MATHEMATICA
LinearRecurrence[{1, 0, 1, -1, 0, 1, -1, 0, -1, 1}, {1, 1, 1, 2, 2, 2, 4, 4, 4, 6}, 100] (* Amiram Eldar, Feb 14 2023 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Jan Snellman (Jan.Snellman(AT)math.su.se), Aug 25 2003
STATUS
approved