Self-convolution of A008485.

Terms

a(0) =1a(1) =2a(2) =11a(3) =54a(4) =279a(5) =1442a(6) =7530a(7) =39474a(8) =207693a(9) =1095522a(10) =5790116a(11) =30650038a(12) =162451560a(13) =861920492a(14) =4577055823a(15) =24323292984a(16) =129338944225a(17) =688128700422