Bell polynomial B(n,k){3,6,6,0,...,0}.

Terms

a(0) =3a(1) =6a(2) =9a(3) =6a(4) =54a(5) =27a(6) =0a(7) =180a(8) =324a(9) =81a(10) =0a(11) =360a(12) =2160a(13) =1620a(14) =243a(15) =0a(16) =360a(17) =9720a(18) =17820a(19) =7290a(20) =729a(21) =0a(22) =0a(23) =30240a(24) =136080a(25) =119070a(26) =30618a(27) =2187a(28) =0a(29) =0