OFFSET
1,1
COMMENTS
Column 2 of A253294
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) +22*a(n-2) -47*a(n-3) +847*a(n-4) -2548*a(n-5) -14241*a(n-6) +46156*a(n-7) -235684*a(n-8) +513456*a(n-9) +3142562*a(n-10) -12248092*a(n-11) +34872668*a(n-12) -44225096*a(n-13) -327631492*a(n-14) +1356943312*a(n-15) -3049192352*a(n-16) +2235968632*a(n-17) +17503809584*a(n-18) -67675653456*a(n-19) +140372058144*a(n-20) -119547407360*a(n-21) -386660564160*a(n-22) +1410208318912*a(n-23) -2855898321408*a(n-24) +4453728916224*a(n-25) -381216535552*a(n-26) -12897724549120*a(n-27) +35949674973184*a(n-28) -73144228077568*a(n-29) +67153529954304*a(n-30) +54469989974016*a(n-31) -290876893462528*a(n-32) +505744121200640*a(n-33) -360592985554944*a(n-34) -244530708480000*a(n-35) +1126160419258368*a(n-36) -1315197520183296*a(n-37) -66806203023360*a(n-38) +1063245997670400*a(n-39) -489223618560000*a(n-40)
EXAMPLE
Some solutions for n=4
..0..1..1....0..0..1....1..0..0....0..0..1....1..0..0....1..2..0....1..2..1
..0..0..2....0..0..2....1..0..0....1..2..2....0..1..0....2..2..1....0..2..2
..0..0..1....1..0..0....1..1..0....1..2..2....1..1..2....0..0..0....0..0..2
..0..2..1....0..2..2....0..2..2....0..1..0....1..2..1....0..1..1....0..1..0
..0..1..2....0..0..2....2..2..1....0..1..1....0..0..1....2..0..2....2..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 29 2014
STATUS
approved