A134827 Alternating row sums of triangle A134285, called s2(3)'.

1, 2, 8, 18, 78, 206, 872, 2226, 10820, 26558, 129248, 335886, 1630174, 3990978, 21778450, 48749804, 274937594, 650637382, 3598954596, 7610277626, 49741540498, 93757794966, 639655810986, 1233712869392, 8530089042832

Offset: 1

Author

Wolfdieter Lang, Nov 13 2007

Keywords

• nonn
• easy

Crossrefs

Cf. A134826 (row sums of triangle A134285).

Formula

a(n) = Sum_{m=1..n} A134285(n,m)*(-1)^(m-1).