1,2

a(4) = 9 = (3 + 3 + 2 + 2), sum of row 4, A131336.

Cf. A131332, A131333, A131334, A131335, A131336.

Sequence in context: A034449 A082894 A091437 this_sequence A062791 A005980 A128093

Adjacent sequences: A131334 A131335 A131336 this_sequence A131338 A131339 A131340

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Jun 29 2007