A134137 Alternating row sums of triangle A049352 (S1p(4)).

1, 3, 9, 15, -159, -3021, -36903, -381249, -3212415, -12995901, 315857961, 12457515663, 304888863969, 6280156107315, 113710631625081, 1717208752084479, 15528594345353217, -265033870991715069, -22048996644203788215

Offset: 1

Author

Wolfdieter Lang Oct 12 2007

Keywords

• sign
• easy

Formula

a(n)=sum(A049352(n,m)*(-1)^(m-1),m=1..n), n>=1.

E.g.f.: 1-exp(-x*(3-3*x+x^2)/(3*(1-x)^3)). Cf. e.g.f. first column of A049352.