Numbers occurring in A137822 : first differences of numbers n such that 3 | sum( Catalan(k), k=1..2n).

A137823

Numbers occurring in A137822 : first differences of numbers n such that 3 | sum( Catalan(k), k=1..2n).

Terms

    a(0) =1a(1) =2a(2) =3a(3) =7a(4) =8a(5) =21a(6) =61a(7) =62a(8) =183a(9) =547a(10) =548a(11) =1641a(12) =4921a(13) =4922a(14) =14763a(15) =44287a(16) =44288a(17) =132861a(18) =398581a(19) =398582a(20) =1195743a(21) =3587227a(22) =3587228a(23) =10761681a(24) =32285041a(25) =32285042a(26) =96855123a(27) =290565367a(28) =290565368a(29) =871696101

External references