Column 1 of triangle A052311.

Terms

a(0) =1a(1) =-1a(2) =0a(3) =1a(4) =0a(5) =-1a(6) =-2a(7) =-1a(8) =8a(9) =25a(10) =26a(11) =-111a(12) =-590a(13) =-1419a(14) =456a(15) =21639a(16) =99822a(17) =202875a(18) =-545926a(19) =-7583365a(20) =-36354050a(21) =-71015561a(22) =372995254a(23) =4834925399a(24) =25950214696a(25) =60006459617a(26) =-337120306782