OFFSET
0,3
REFERENCES
J. C. P. Miller, On the enumeration of partially ordered sets of integers, pp. 109-124 of T. P. McDonough and V. C. Mavron, editors, Combinatorics: Proceedings of the Fourth British Combinatorial Conference 1973. London Mathematical Society, Lecture Note Series, Number 13, Cambridge University Press, NY, 1974. The g.f. is G_{ref}(t) on page 122, corrected. (The version of G_{ref}(t) stated on page 122 gives A256975, which does not match the terms on page 123.)
LINKS
Ray Chandler, Table of n, a(n) for n = 0..1000
Index entries for linear recurrences with constant coefficients, signature (-1,0,1,2,2,2,1,0,-2,-4,-5,-4,-2,0,3,5,6,5,3,0,-2,-4,-5,-4,-2,0,1,2,2,2,1,0,-1,-1).
FORMULA
a(n) = floor(67/4838400*n^5 + 67/96768*n^4 + 2371/181440*n^3 + 29/252*n^2 + 170839/362880*n + 12232033/12700800 - (n mod 2)*(1/4608*n^3 + 5/768*n^2 + 223/3072*n) + (((n+1) mod 3) - (n mod 3))*n/162 + (((n+2) mod 4) + ((n+3) mod 4) - ((n+1) mod 4) - (n mod 4))*n*3/512 + (((n+3) mod 4) - (n mod 4))/8). - Hoang Xuan Thanh, Jun 07 2026
MAPLE
(1+x^4-x^5-x^6-x^10-x^11+x^12+x^16)/mul(1-x^i, i=1..8);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
N. J. A. Sloane, Apr 22 2015
STATUS
approved
