First differences of A172298.

Terms

a(0) =-2a(1) =2a(2) =-1a(3) =1a(4) =-1a(5) =1a(6) =-1a(7) =1a(8) =-1a(9) =25a(10) =-25a(11) =477481a(12) =-477481a(13) =49a(14) =-49a(15) =13082689a(16) =-13082689a(17) =1924313689a(18) =-1924313689a(19) =30489001321a(20) =-30489001321a(21) =730192467169a(22) =-730192467169