OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = a(n-1) +64*a(n-2) -64*a(n-3) -1774*a(n-4) +1774*a(n-5) +28396*a(n-6) -28396*a(n-7) -294326*a(n-8) +294326*a(n-9) +2094938*a(n-10) -2094938*a(n-11) -10579203*a(n-12) +10579203*a(n-13) +38573258*a(n-14) -38573258*a(n-15) -102289192*a(n-16) +102289192*a(n-17) +197108892*a(n-18) -197108892*a(n-19) -273632948*a(n-20) +273632948*a(n-21) +268830864*a(n-22) -268830864*a(n-23) -181152608*a(n-24) +181152608*a(n-25) +79213344*a(n-26) -79213344*a(n-27) -20157312*a(n-28) +20157312*a(n-29) +2257920*a(n-30) -2257920*a(n-31).
EXAMPLE
Some solutions for n=4:
1 4 1 4 1 4 1 1 2 1 2 0 2 1 3 0 1 0 3 0 3
0 2 0 2 0 2 0 2 4 2 4 3 4 2 4 2 4 2 4 2 4
3 4 3 4 3 4 3 1 2 1 2 0 2 1 1 0 3 0 3 0 3
1 3 1 3 1 3 1 2 4 2 4 3 4 2 4 2 4 2 4 2 4
3 4 3 4 3 4 3 1 2 1 2 0 2 1 3 0 1 0 1 0 1
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 01 2014
STATUS
approved