OFFSET
1,1
COMMENTS
Row 4 of A200329
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..200
FORMULA
Empirical: a(n) = a(n-1) -a(n-3) +a(n-4) +a(n-9) -a(n-11) +a(n-12) -a(n-14) +a(n-15) -a(n-16) +a(n-18) -2*a(n-19) +a(n-20) -a(n-22) +a(n-23) -a(n-24) +a(n-26) -a(n-27) +a(n-29) +a(n-34) -a(n-35) +a(n-37) -a(n-38).
Empirical: G.f.: -x*(-2 -x -x^2 -35*x^20 -27*x^21 -29*x^22 -24*x^23 -18*x^24 -19*x^25 -2*x^30- 2*x^31 -2*x^32 -2*x^33 -x^35 -x^36 +x^37 -14*x^26 -8*x^27 -9*x^28 -8*x^29 -3*x^3 -2*x^4 -8*x^5 -8*x^6 -8*x^7 -16*x^8 -18*x^9 -17*x^10 -26*x^11 -28*x^12 -27*x^13 -36*x^14 -32*x^15 -33*x^16 -41*x^17 -31*x^18 -34*x^19) / ( (x^2-x+1) *(x^4-x^3+x^2-x+1) *(x^6+x^3+1) *(x^8-x^7+x^5-x^4+x^3-x+1)* (1+x)^2 *(1+x+x^2)^2 *(x^4+x^3+x^2+x+1)^2 *(x-1)^4 ). - R. J. Mathar, Mar 07 2015
EXAMPLE
All solutions for n=6
..6....4....0....6....1....3....3....5....0....2....6....0....3
..6....4....0....3....1....5....3....5....3....2....5....1....1
..6....4....0....1....1....6....3....5....5....2....4....2....0
..6....4....0....0....1....6....3....5....6....2....3....3....0
..6....4....0....0....1....5....3....5....6....2....2....4....1
..6....4....0....1....1....3....3....5....5....2....1....5....3
..6....4....0....3....1....0....3....5....3....2....0....6....6
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 16 2011
STATUS
approved