1,2

a(4) = 24 = (1, 3, 1, 3) dot (8, 4, 1, 1) = (8 + 12, + 1 + 3).

Sequence in context: A006640 A115641 A153334 this_sequence A099176 A116556 A010366

Adjacent sequences: A159609 A159610 A159611 this_sequence A159613 A159614 A159615

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Apr 17 2009