Binomial coefficient C(2n,n-11).

Terms

a(0) =1a(1) =24a(2) =325a(3) =3276a(4) =27405a(5) =201376a(6) =1344904a(7) =8347680a(8) =48903492a(9) =273438880a(10) =1471442973a(11) =7669339132a(12) =38910617655a(13) =192928249296a(14) =937845656300