An inverse Chebyshev transform of the Pell numbers.

Terms

a(0) =0a(1) =1a(2) =2a(3) =8a(4) =20a(5) =64a(6) =172a(7) =512a(8) =1416a(9) =4096a(10) =11468a(11) =32768a(12) =92248a(13) =262144a(14) =739832a(15) =2097152a(16) =5925520a(17) =16777216a(18) =47429900a(19) =134217728a(20) =379536440a(21) =1073741824a(22) =3036661032a(23) =8589934592a(24) =24294699120a(25) =68719476736a(26) =194363001272a(27) =549755813888