2,2

Each term in the sequence is a sum of tetrahedral numbers.

Row sums of triangle A143419

a(5) = 370 = (20 + 165 + 165 + 20) = C(6,3) + C(11,3) + C(11,8)+ C(6,3).

Cf. A143419.

Sequence in context: A110184 A013698 A154245 this_sequence A075734 A033890 A010924

Adjacent sequences: A143417 A143418 A143419 this_sequence A143421 A143422 A143423

nonn

Gary W. Adamson (qntmpkt(AT)yahoo.com), Aug 14 2008