1,2
a(4) = 15 = sum of row 4, triangle A131411; (3 + 3 + 4 + 5).
Cf. A131411.
Sequence in context: A147672 A192962 A095091 * A151998 A052130 A065506
Adjacent sequences: A131409 A131410 A131411 * A131413 A131414 A131415
nonn
Gary W. Adamson (qntmpktK(AT)yahoo.com), Jul 08 2007