A convolution triangle of numbers based on A071356.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =4a(5) =1a(6) =20a(7) =16a(8) =6a(9) =1a(10) =72a(11) =64a(12) =30a(13) =8a(14) =1a(15) =272a(16) =260a(17) =140a(18) =48a(19) =10a(20) =1a(21) =1064a(22) =1072a(23) =636a(24) =256a(25) =70a(26) =12a(27) =1a(28) =4272a(29) =4480