a(n) = A113290(n,1)/(n+1) for n>=0, where A113290 is the matrix log of triangle A113287.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =-2a(5) =4a(6) =-7a(7) =13a(8) =-24a(9) =48a(10) =-99a(11) =221a(12) =-512a(13) =1268a(14) =-3247a(15) =8773a(16) =-24400a(17) =70896a(18) =-211347a(19) =653541a(20) =-2068472a(21) =6755684a(22) =-22541135a(23) =77305981a(24) =-270435640a(25) =969413776a(26) =-3539893923a(27) =13212871629a(28) =-50180362320a(29) =194412817844