Self-convolution equals A112565.

Terms

a(0) =1a(1) =1a(2) =3a(3) =11a(4) =47a(5) =193a(6) =869a(7) =3583a(8) =12399a(9) =51287a(10) =217551a(11) =867797a(12) =3274727a(13) =13099145a(14) =55568089a(15) =216651145a(16) =878354151a(17) =3609915051a(18) =13596245715a(19) =55617915013a(20) =220140920491a(21) =676614665133