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

1,2

Links

Table of n, a(n) for n=1..25.

Formula

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

Crossrefs

Cf. A134826 (row sums of triangle A134285).

Sequence in context: A074128 A376114 A061226 * A222361 A134789 A058217

Adjacent sequences: A134824 A134825 A134826 * A134828 A134829 A134830

Keyword

nonn,easy

Author

Wolfdieter Lang, Nov 13 2007

Status

approved