Last number in row n of triangle A199636.

Terms

a(0) =5a(1) =3a(2) =21a(3) =13a(4) =85a(5) =53a(6) =341a(7) =227a(8) =1365a(9) =909a(10) =5461a(11) =3637a(12) =21845a(13) =14563a(14) =87381a(15) =58253a(16) =349525a(17) =233013a(18) =1398101a(19) =932067a(20) =5592405a(21) =3728269a(22) =22369621a(23) =14913077a(24) =89478485a(25) =59652323a(26) =357913941a(27) =238609293a(28) =1431655765a(29) =954437173