OFFSET
1,1
COMMENTS
Column 4 of A227125
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/121645100408832000)*n^19 + (1/43553562624000)*n^17 + (107/8966909952000)*n^15 + (1/2905943040)*n^14 - (1275569/188305108992000)*n^13 + (23/68428800)*n^12 - (5672753/1379524608000)*n^11 + (191/6220800)*n^10 + (1099466111/1379524608000)*n^9 - (2116283/101606400)*n^8 + (12673870051501/47076277248000)*n^7 - (2627953/1555200)*n^6 + (133732420531/124540416000)*n^5 + (312421343/4276800)*n^4 - (1712634732923/2940537600)*n^3 + (154276843207/75675600)*n^2 - (88924473629/29099070)*n + 944 for n>6
EXAMPLE
Some solutions for n=4
..1..1..1..1....1..1..1..1....0..0..0..0....0..0..0..0....1..1..0..0
..1..1..0..0....1..0..0..0....0..0..0..0....0..0..0..0....1..0..0..0
..1..0..0..0....1..0..0..0....0..0..0..0....0..0..0..1....0..0..0..1
..0..0..0..0....0..0..0..0....0..1..0..0....0..0..0..1....0..0..1..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 01 2013
STATUS
approved