A143420 Row sums of triangle A143419.

1, 8, 55, 370, 2520, 15272, 123151

Offset

2,2

Comments

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

Links

Table of n, a(n) for n=2..8.

Formula

Row sums of triangle A143419

Example

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

Crossrefs

Cf. A143419.

Sequence in context: A110184 A013698 A154245 * A075734 A033890 A010924

Adjacent sequences: A143417 A143418 A143419 * A143421 A143422 A143423

Keyword

nonn

Author

Gary W. Adamson, Aug 14 2008

Status

approved