Second diagonal of triangle A113647 (called Y(2,1)).
A115137
Second diagonal of triangle A113647 (called Y(2,1)).
Terms
- a(0) =1a(1) =1a(2) =7a(3) =41a(4) =247a(5) =1545a(6) =9975a(7) =66057a(8) =446455a(9) =3067913a(10) =21372919a(11) =150618121a(12) =1071841271a(13) =7691763721a(14) =55600938999a(15) =404488323081
External references
- oeis: A115137