OFFSET
1,4
COMMENTS
Table starts
...0.....1.......4........10..........20............35...............56
...1.....6......27........96.........281...........708.............1590
...4....27.....142.......701........3183.........12875............46236
..10....96.....701......4872.......34038........229887..........1429751
..20...281....3183.....34038......366982.......4058169.........44208465
..35...708...12875....229887.....4058169......72941420.......1349344763
..56..1590...46236...1429751....44208465....1349344763......41820621848
..84..3264..149099...8023290...451571539...24833319003....1335072188627
.120..6237..438091..40628537..4213513472..434369879650...42737962734110
.165.11242.1188762.187182375.35702217342.7020524920612.1315545171895930
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..199
FORMULA
Empirical for column k:
k=1: a(n) = (1/6)*n^3 - (1/6)*n
k=2: [polynomial of degree 7]
k=3: [polynomial of degree 15]
k=4: [polynomial of degree 31]
k=5: [polynomial of degree 63]
k=6: [polynomial of degree 127]
EXAMPLE
Some solutions for n=4 k=4
..0..1..1..1. .0..1..1..1. .0..1..1..1. .0..0..1..1. .0..0..1..1
..1..0..0..1. .0..1..1..1. .1..0..0..1. .1..0..0..0. .0..0..0..1
..1..1..1..1. .0..0..1..1. .0..0..0..1. .1..0..0..0. .0..0..1..0
..0..0..1..0. .1..0..0..1. .1..0..0..0. .1..1..0..0. .0..1..1..1
CROSSREFS
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Nov 19 2016
STATUS
approved