A weighted sum of Jacobi function values.

Terms

a(0) =1a(1) =3a(2) =7a(3) =13a(4) =31a(5) =63a(6) =105a(7) =255a(8) =511a(9) =869a(10) =2047a(11) =3963a(12) =7021a(13) =16383a(14) =32767a(15) =56141a(16) =125811a(17) =262143a(18) =449325a(19) =1048575a(20) =2097151a(21) =3459945a(22) =8388607a(23) =16645111a(24) =28760685a(25) =67108863a(26) =129822555a(27) =230087021a(28) =536870911a(29) =1073741823