Diagonal elements A122445(n+1,n) of the pendular trinomial triangle A122445.
A122448
Diagonal elements A122445(n+1,n) of the pendular trinomial triangle A122445.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =10a(4) =36a(5) =135a(6) =525a(7) =2094a(8) =8524a(9) =35266a(10) =147862a(11) =626884a(12) =2682940a(13) =11575707a(14) =50295809a(15) =219879814a(16) =966487380a(17) =4268781902a(18) =18936044682a(19) =84326759820a(20) =376853237480
External references
- oeis: A122448