[Pascal's beasts]
#bbcmicrobot
MO.1:P."Pascal's beasts":V.5
DIMa(30,30):a(1,1)=1:O%=1:F.N%=2TO30:F.K%=1TON%:a(N%,K%)=a(N%-O%,K%-O%)+a(N%-O%,K%):N.,
F.Q%=7TO30:GC.0,1+Q%MOD3:F.X%=1TOQ%:Y%=512:a=a(Q%,X%):i=1:REP.IFi ANDa PL.69,W%,Y%
Y%=Y%+4:i=i+i:U.i>a:W%=W%+4:N.,

#bbcmicrobot
MO.1:P."Pascal's beasts":V.5
DIMa(30,30):a(1,1)=1:O%=1:F.N%=2TO30:F.K%=1TON%:a(N%,K%)=a(N%-O%,K%-O%)+a(N%-O%,K%):N.,
F.Q%=7TO30:GC.0,1+Q%MOD3:F.X%=1TOQ%:Y%=512:a=a(Q%,X%):i=1:REP.IFi ANDa PL.69,W%,Y%
Y%=Y%+4:i=i+i:U.i>a:W%=W%+4:N.,