A187457 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with the array of 2X2 subblock determinants symmetric

16, 81, 264, 256, 5175, 10776, 625, 38464, 1293651, 1011136, 1296, 187525, 34166592, 983320335, 229028648, 2401, 628992, 450657775, 99952737952, 2806943351103, 121525356464, 4096, 1938979, 3553508880, 3764498129375, 1694940245504992

Offset

1,1

Comments

Table starts

........16............81..............256................625...........1296

.......264..........5175............38464.............187525.........628992

.....10776.......1293651.........34166592..........450657775.....3553508880

...1011136.....983320335......99952737952......3764498129375.63480204115632

.229028648.2806943351103.1694940245504992.268361727217027575

Links

R. H. Hardin, Table of n, a(n) for n = 1..40

Example

Some k=3 solutions for 4X4
..0..0..0..1....0..0..0..0....0..0..0..3....0..0..0..1....0..0..0..1
..2..0..0..0....1..0..0..0....1..0..0..0....1..0..0..0....2..0..0..3
..0..0..2..3....0..0..1..3....0..0..0..2....0..0..0..2....0..0..0..3
..3..0..1..1....2..0..2..1....1..0..1..2....1..2..2..1....2..2..2..2

Crossrefs

Sequence in context: A075578 A113316 A113317 * A056118 A372998 A351602

Adjacent sequences: A187454 A187455 A187456 * A187458 A187459 A187460

Keyword

nonn,tabl

Author

R. H. Hardin Mar 10 2011

Status

approved