Second entry in row n of triangle in A169940.

Terms

a(0) =1a(1) =0a(2) =3a(3) =4a(4) =7a(5) =8a(6) =21a(7) =20a(8) =53a(9) =56a(10) =89a(11) =112a(12) =197a(13) =220a(14) =397a(15) =456a(16) =711a(17) =850a(18) =1347a(19) =1428a(20) =2303a(21) =2642a(22) =3777a(23) =4636a(24) =6693a(25) =7550a(26) =11109a(27) =12876a(28) =17965a(29) =21000