A123838 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 4 X 4.

1, 13, 869, 69479, 6131125, 571764366, 55449596876

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Crossrefs

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

Sequence in context: A296803 A289225 A331341 * A294793 A013539 A201255

Adjacent sequences: A123835 A123836 A123837 * A123839 A123840 A123841

Keyword

nonn,hard

Author

Søren Eilers, Oct 29 2006

Status

approved