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A123824
Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 2 X 3.
1
1, 16, 697, 34958, 1947321, 114675898, 7026150623, 443114008903, 28575438072945, 1875587744568411
OFFSET
1,2
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Søren Eilers, Oct 29 2006
EXTENSIONS
a(9) from Matthias Simon, Aug 29 2020
a(10) from Matthias Simon, Nov 15 2020
STATUS
approved