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A187633 T(n,k)=Number of (n+1)X(n+1) 0..k arrays with the array of 2X2 subblock determinants antisymmetric under horizontal and vertical reflection and each non-centerline 2X2 subblock nonsingular 6
10, 31, 24, 64, 446, 24, 113, 2924, 1648, 954, 170, 12104, 14044, 557382, 954, 255, 37448, 106892, 31903442, 672698, 194008, 336, 98014, 306320, 686589106, 33869160, 21411605018, 194008, 449, 221640, 1848504, 7836968262, 795758912 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

.....10..........31.......64.......113........170.....255....336.449

.....24.........446.....2924.....12104......37448...98014.221640

.....24........1648....14044....106892.....306320.1848504

....954......557382.31903442.686589106.7836968262

....954......672698.33869160.795758912

.194008.21411605018

.194008

LINKS

Table of n, a(n) for n=1..33.

EXAMPLE

Some k=3 solutions for 5X5

..2..0..2..1..2....2..0..2..0..2....2..0..2..1..2....2..0..2..1..3

..0..1..0..1..0....0..3..2..3..0....0..2..0..2..0....0..3..0..3..3

..3..1..3..1..3....2..0..2..0..2....2..1..2..0..2....2..0..2..0..2

..0..1..0..1..0....0..3..0..3..0....0..2..0..2..2....1..3..0..3..3

..2..2..2..1..2....2..3..2..0..2....2..2..2..0..2....3..3..2..1..3

CROSSREFS

Row 1 is A059306

Row 2 is A187625

Sequence in context: A247207 A187521 A187624 * A063154 A100500 A209994

Adjacent sequences:  A187630 A187631 A187632 * A187634 A187635 A187636

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin Mar 12 2011

STATUS

approved

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Last modified September 27 15:44 EDT 2021. Contains 347691 sequences. (Running on oeis4.)