Apply partial sum operator 4 times to Stern's sequence.

Terms

a(0) =1a(1) =5a(2) =16a(3) =41a(4) =93a(5) =196a(6) =394a(7) =771a(8) =1488a(9) =2854a(10) =5463a(11) =10479a(12) =20186a(13) =39068a(14) =75932a(15) =148083a(16) =289822a(17) =569157a(18) =1120940a(19) =2212591a(20) =4374466a(21) =8658470a(22) =17159606a(23) =34050575a(24) =67642478a(25) =134489509a(26) =267565204a(27) =532549215