1,4
W. F. Lunnon, Counting multidimensional polyominoes. Computer Journal 18 (1975), no. 4, pp. 366-367.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=1..12.
A column of A195738.
Sequence in context: A179300 A199493 A089815 * A073513 A074524 A212280
Adjacent sequences: A006756 A006757 A006758 * A006760 A006761 A006762
nonn
N. J. A. Sloane.
approved