a(n) = (A077446(n) + 1)/2 for n >= 0.

Terms

a(0) =0a(1) =1a(2) =3a(3) =6a(4) =16a(5) =33a(6) =91a(7) =190a(8) =528a(9) =1105a(10) =3075a(11) =6438a(12) =17920a(13) =37521a(14) =104443a(15) =218686a(16) =608736a(17) =1274593a(18) =3547971a(19) =7428870a(20) =20679088a(21) =43298625a(22) =120526555a(23) =252362878a(24) =702480240a(25) =1470878641a(26) =4094354883a(27) =8572908966a(28) =23863649056a(29) =49966575153