Generalized Stirling2 array (7,2).

Terms

a(0) =1a(1) =42a(2) =14a(3) =1a(4) =5544a(5) =3192a(6) =588a(7) =42a(8) =1a(9) =1507968a(10) =1165248a(11) =321552a(12) =41496a(13) =2688a(14) =84a(15) =1a(16) =696681216a(17) =655966080a(18) =232606080a(19) =41497344a(20) =4143552a(21) =240240a(22) =7980a(23) =140a(24) =1a(25) =489070213632a(26) =533531142144a(27) =226306918656a(28) =50249808000a(29) =6575950080