Triangle read by rows: see A128196 for definition.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =4a(6) =15a(7) =30a(8) =20a(9) =8a(10) =105a(11) =210a(12) =140a(13) =56a(14) =16a(15) =945a(16) =1890a(17) =1260a(18) =504a(19) =144a(20) =32a(21) =10395a(22) =20790a(23) =13860a(24) =5544a(25) =1584a(26) =352a(27) =64a(28) =135135a(29) =270270