OFFSET
0,2
LINKS
Rémy Sigrist, Table of n, a(n) for n = 0..1000
Reticular Chemistry Structure Resource (RCSR), The bil tiling (or net)
Rémy Sigrist, Illustration of first terms
Rémy Sigrist, PARI program for A298795
FORMULA
Conjectures from Colin Barker, Mar 30 2018: (Start)
G.f.: (1 + 2*x + 5*x^2 + 6*x^3 + 11*x^4 + 12*x^5 + 15*x^6 + 12*x^7 + 19*x^8 + 12*x^9 + 15*x^10 + 12*x^11 + 11*x^12 + 8*x^13 + 5*x^14 + 2*x^15 + x^16 - x^18) / ((1 - x)^2*(1 + x^2)*(1 - x + x^2 - x^3 + x^4)*(1 + x + x^2 + x^3 + x^4)^2).
a(n) = a(n-1) - 2*a(n-2) + 2*a(n-3) - 2*a(n-4) + 3*a(n-5) - 3*a(n-6) + 4*a(n-7) - 4*a(n-8) + 4*a(n-9) - 3*a(n-10) + 3*a(n-11) - 2*a(n-12) + 2*a(n-13) - 2*a(n-14) + a(n-15) - a(n-16) for n>16.
(End)
PROG
(PARI) See Links section.
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Jan 27 2018
EXTENSIONS
More terms from Rémy Sigrist, Mar 30 2018
STATUS
approved