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A123778 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1x4. 0
1, 12, 425, 17610, 818803, 40408828, 2078794759, 110210311068 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

Cf. A112389, A123762 - A123827, A123829 - A123849.

Sequence in context: A000897 A036687 A262858 * A129006 A067429 A054913

Adjacent sequences:  A123775 A123776 A123777 * A123779 A123780 A123781

KEYWORD

nonn,hard

AUTHOR

Søren Eilers, Oct 29 2006

STATUS

approved

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Last modified April 23 05:42 EDT 2021. Contains 343199 sequences. (Running on oeis4.)