Partial sums of A337281.

Terms

a(0) =0a(1) =0a(2) =2a(3) =5a(4) =13a(5) =33a(6) =75a(7) =166a(8) =358a(9) =754a(10) =1564a(11) =3203a(12) =6491a(13) =13043a(14) =26021a(15) =51596a(16) =101772a(17) =199828a(18) =390790a(19) =761537a(20) =1479337a(21) =2865589a(22) =5536719a(23) =10673010a(24) =20530866a(25) =39417766a(26) =75545728a(27) =144551167a(28) =276172727a(29) =526908583