Second convolution of A065096.

Terms

a(0) =0a(1) =0a(2) =1a(3) =12a(4) =98a(5) =684a(6) =4403a(7) =27048a(8) =161412a(9) =945288a(10) =5466549a(11) =31340628a(12) =178604998a(13) =1013573652a(14) =5735117479a(15) =32385232272a(16) =182622362504