Nonzero coefficients of the polynomials (x + d/dx)^n x^2, in row-major order.

Terms

a(0) =1a(1) =2a(2) =1a(3) =2a(4) =5a(5) =1a(6) =12a(7) =9a(8) =1a(9) =12a(10) =39a(11) =14a(12) =1a(13) =90a(14) =95a(15) =20a(16) =1a(17) =90a(18) =375a(19) =195a(20) =27a(21) =1a(22) =840a(23) =1155a(24) =357a(25) =35a(26) =1a(27) =840a(28) =4305a(29) =2940