Coefficients of Chebyshev polynomials.

Terms

a(0) =2a(1) =13a(2) =49a(3) =140a(4) =336a(5) =714a(6) =1386a(7) =2508a(8) =4290a(9) =7007a(10) =11011a(11) =16744a(12) =24752a(13) =35700a(14) =50388a(15) =69768a(16) =94962a(17) =127281a(18) =168245a(19) =219604a(20) =283360a(21) =361790a(22) =457470a(23) =573300a(24) =712530a(25) =878787a(26) =1076103a(27) =1308944a(28) =1582240a(29) =1901416