Self-convolution square-root of A118926.

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =47a(5) =219a(6) =1083a(7) =5597a(8) =29933a(9) =164547a(10) =925289a(11) =5303409a(12) =30898069a(13) =182587159a(14) =1092498017a(15) =6609496707a(16) =40383429717a(17) =248940496629