Binomial coefficient C(27,n).

Terms

a(0) =1a(1) =27a(2) =351a(3) =2925a(4) =17550a(5) =80730a(6) =296010a(7) =888030a(8) =2220075a(9) =4686825a(10) =8436285a(11) =13037895a(12) =17383860a(13) =20058300a(14) =20058300a(15) =17383860a(16) =13037895a(17) =8436285a(18) =4686825a(19) =2220075a(20) =888030a(21) =296010a(22) =80730a(23) =17550a(24) =2925a(25) =351a(26) =27a(27) =1