A generalized Chebyshev transform of the Jacobsthal numbers.

Terms

a(0) =0a(1) =1a(2) =1a(3) =7a(4) =11a(5) =47a(6) =95a(7) =327a(8) =759a(9) =2343a(10) =5863a(11) =17095a(12) =44551a(13) =126023a(14) =335687a(15) =934343a(16) =2518215a(17) =6948807a(18) =18846663a(19) =51765703a(20) =140875207a(21) =385980871a(22) =1052314055a(23) =2879386055a(24) =7857807815a(25) =21485572551a(26) =58664391111a(27) =160344666567