Convolution of A055854 with A011782.

Terms

a(0) =0a(1) =1a(2) =10a(3) =64a(4) =328a(5) =1462a(6) =5908a(7) =22180a(8) =78592a(9) =265729a(10) =864146a(11) =2719028a(12) =8316200a(13) =24814832a(14) =72453344a(15) =207502016a(16) =584094080a(17) =1618757120a(18) =4423347200a(19) =11932579840a(20) =31812874240a(21) =83901227008a(22) =219074805760a(23) =566754967552