Antidiagonal sums of the convolution array A213587.

Terms

a(0) =1a(1) =6a(2) =20a(3) =55a(4) =135a(5) =308a(6) =668a(7) =1395a(8) =2830a(9) =5610a(10) =10914a(11) =20904a(12) =39515a(13) =73860a(14) =136720a(15) =250937a(16) =457137a(17) =827260a(18) =1488190a(19) =2662905a(20) =4741946a(21) =8407236a(22) =14846100a(23) =26120400a(24) =45801925a(25) =80064018a(26) =139553708a(27) =242597035a(28) =420678315a(29) =727792580