A014486-encoding of the Catalan mountain ranges with only even-length slopes allowed.

Terms

a(0) =0a(1) =12a(2) =204a(3) =240a(4) =3276a(5) =3312a(6) =3852a(7) =3888a(8) =4032a(9) =52428a(10) =52464a(11) =53004a(12) =53040a(13) =53184a(14) =61644a(15) =61680a(16) =62220a(17) =62256a(18) =62400a(19) =64524a(20) =64560a(21) =64704a(22) =65280a(23) =838860a(24) =838896a(25) =839436a(26) =839472a(27) =839616a(28) =848076a(29) =848112