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A337621
a(n) is the length of the largest run of contiguous grid points on the n-th antidiagonal of the Even Conant lattice that are not on an edge, or 0 if no such point exists.
2
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 1, 2, 1, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 3, 3, 2, 2, 1, 2, 3, 4, 4, 3, 2, 1, 2, 2, 2, 1, 1, 1, 2, 1, 1, 2, 2, 1, 2, 2, 3, 4, 5, 5, 5, 5, 4, 4, 4, 3, 2, 2, 3, 4, 5, 6, 7, 8, 8, 7, 6, 5, 4, 3, 2, 3, 4, 4, 4, 4, 4, 3, 2
OFFSET
0,15
FORMULA
a(n) <= A337620(n).
Apparently, abs(a(2*n) - 2*a(n)) <= 1.
EXAMPLE
See Links section.
PROG
(C++) See Links section.
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Rémy Sigrist, Sep 09 2020
STATUS
approved