Convolution of A055853 with A011782.

Terms

a(0) =0a(1) =1a(2) =9a(3) =53a(4) =253a(5) =1059a(6) =4043a(7) =14407a(8) =48639a(9) =157184a(10) =489872a(11) =1480608a(12) =4358752a(13) =12541184a(14) =35364864a(15) =97960192a(16) =267050240a(17) =717619200a(18) =1903452160a(19) =4989337600a(20) =12937052160a(21) =33212530688a(22) =84484882432a(23) =213090238464a(24) =533236219904