a(n) = A352682(4, n).

Terms

a(0) =1a(1) =4a(2) =5a(3) =14a(4) =42a(5) =145a(6) =566a(7) =2446a(8) =11547a(9) =58980a(10) =323458a(11) =1892559a(12) =11751904a(13) =77101510a(14) =532426225a(15) =3857129474a(16) =29229557534a(17) =231113610537