Hello SeqFans, just add to a(n) the product of the two closest digits to the comma printed before a(n); start with a(1)=a(2)=1: S=1 , 1,2 , 4,1 2,1 6,1 8,2 4,4 0,5 6,5 6,9 6,1 50,156,156,162,168,170,178,178,186,194,200,208,208,224,240,248,248,256, ... Best, E.