Negated coefficients of Chebyshev T polynomials: [x^n](-T(n+6, x)), n >= 0.

Terms

a(0) =1a(1) =7a(2) =32a(3) =120a(4) =400a(5) =1232a(6) =3584a(7) =9984a(8) =26880a(9) =70400a(10) =180224a(11) =452608a(12) =1118208a(13) =2723840a(14) =6553600a(15) =15597568a(16) =36765696a(17) =85917696a(18) =199229440a(19) =458752000a(20) =1049624576a(21) =2387607552a(22) =5402263552a(23) =12163481600a(24) =27262976000a(25) =60850962432