OFFSET
1,2
LINKS
Mitchel T. Keller, Stephen J. Young, Hereditary Semiorders and Enumeration of Semiorders by Dimension, arXiv:1801.00501 [math.CO], 2018.
Index entries for linear recurrences with constant coefficients, signature (12,-61,172,-294,311,-197,66,-7).
FORMULA
G.f.: -x*(5*x^7 - 41*x^6 + 101*x^5 - 129*x^4 + 96*x^3 - 42*x^2 + 10*x - 1)/(7*x^8 - 66*x^7 + 197*x^6 - 311*x^5 + 294*x^4 - 172*x^3 + 61*x^2 - 12*x + 1).
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Mitchel T. Keller, Oct 10 2017
STATUS
approved