Diagonal elements A122445(n+2,n) of the pendular trinomial triangle A122445.
A122449
Diagonal elements A122445(n+2,n) of the pendular trinomial triangle A122445.
Terms
- a(0) =1a(1) =2a(2) =6a(3) =22a(4) =83a(5) =324a(6) =1298a(7) =5302a(8) =22002a(9) =92488a(10) =392996a(11) =1685232a(12) =7283511a(13) =31694460a(14) =138746706a(15) =610601374a(16) =2699835614a(17) =11988069480a(18) =53433418716a(19) =238986495540
External references
- oeis: A122449