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A263677 Irregular table read by rows, n >= 1, k >= 0: T(n,k) is the number of binary symmetric n X n matrices with k holes that are squares, where the axes of symmetry are horizontal and vertical. 1
1, 1, 3, 1, 3, 1, 28, 15, 11, 0, 6, 3, 30, 16, 0, 0, 3, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
COMMENTS
Inspired by A258643 but the axes of symmetry are the same as in A262742. The mirror patterns and nonsquare holes are excluded.
LINKS
EXAMPLE
Irregular table begins:
n\k 0 1 2 3 4 5 ...
1 1
2 1
3 3 1
4 3 1
5 28 15 11 0 6 3
6 30 16 0 0 3 3
...
CROSSREFS
Sequence in context: A262940 A278601 A281038 * A099906 A262026 A270390
KEYWORD
nonn,tabf,more
AUTHOR
Kival Ngaokrajang, Oct 23 2015
STATUS
approved

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Last modified March 29 01:36 EDT 2024. Contains 371264 sequences. (Running on oeis4.)