Triangle read by rows: (1/n)*T(n,h), where T(n,h) is the array in A101817.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =6a(5) =2a(6) =1a(7) =21a(8) =36a(9) =6a(10) =1a(11) =60a(12) =300a(13) =240a(14) =24a(15) =1a(16) =155a(17) =1800a(18) =3900a(19) =1800a(20) =120a(21) =1a(22) =378a(23) =9030a(24) =42000a(25) =50400a(26) =15120a(27) =720a(28) =1a(29) =889