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Triangular polyominoes (n-iamonds) without bilateral symmetry (holes are allowed).
6

%I #12 Oct 28 2023 15:28:19

%S 0,0,0,1,2,7,19,54,147,418,1150,3254,9138,25953,73717,210719,603370,

%T 1734739,4998542,14444576,41829991,121406927,353029078,1028417980,

%U 3000754648,8769118355,25661830891,75194886765,220605144778,647942827064,1905103686527,5607037213434,16517892572160,48703328674762

%N Triangular polyominoes (n-iamonds) without bilateral symmetry (holes are allowed).

%H John Mason, <a href="/A030224/b030224.txt">Table of n, a(n) for n = 1..52</a>

%Y Cf. A000577, A006534, A030223, A030224.

%K nonn

%O 1,5

%A _David W. Wilson_

%E More terms from _Joseph Myers_, Sep 24 2002

%E More terms from _John Mason_, Oct 28 2023