A024734 a(n) = s(n+3)/7, where s is A024734.

1, 1, 1, 8, 15, 22, 78, 190, 400, 1051, 2535, 6721, 16640, 41553, 106597, 275234, 701268, 1767487, 4523226, 12032511, 31091390, 79566390, 206917572, 552688025, 1439957527, 3731510679, 9775071839, 26240674825, 68869388526, 179940240495, 474904867970