Column 1 of triangle A121391, where column k of T=A121391 equals column k of T^(k+1) shift down 1 row.
A121392
Column 1 of triangle A121391, where column k of T=A121391 equals column k of T^(k+1) shift down 1 row.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =5a(4) =15a(5) =55a(6) =252a(7) =1449a(8) =10305a(9) =88611a(10) =901204a(11) =10642707a(12) =143771206a(13) =2194484737a(14) =37458097842a(15) =708733666387
External references
- oeis: A121392