0,2

a(3) = 21 since row 3 of triangle A141155 = (7, 6, 5, 3). 21 = (7 + 6 + 5 + 3).

Cf. A141155.

Sequence in context: A052101 A063830 A062444 this_sequence A014286 A000714 A090984

Adjacent sequences: A141153 A141154 A141155 this_sequence A141157 A141158 A141159

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Jun 12 2008