Number of ways to add n ordinals.

Terms

a(0) =1a(1) =2a(2) =5a(3) =13a(4) =33a(5) =81a(6) =193a(7) =449a(8) =1089a(9) =2673a(10) =6561a(11) =15633a(12) =37249a(13) =88209a(14) =216513a(15) =531441a(16) =1266273a(17) =3017169a(18) =7189057a(19) =17537553a(20) =43046721a(21) =102568113a(22) =244390689a(23) =582313617a(24) =1420541793a(25) =3486784401a(26) =8308017153a(27) =19795645809a(28) =47167402977a(29) =115063885233