Variant of triangle A008301, read by rows of 2*n+1 terms, such that the first column is the secant numbers (A000364).
A125053
Variant of triangle A008301, read by rows of 2*n+1 terms, such that the first column is the secant numbers (A000364).
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =5a(5) =15a(6) =21a(7) =15a(8) =5a(9) =61a(10) =183a(11) =285a(12) =327a(13) =285a(14) =183a(15) =61a(16) =1385a(17) =4155a(18) =6681a(19) =8475a(20) =9129a(21) =8475a(22) =6681a(23) =4155a(24) =1385a(25) =50521a(26) =151563a(27) =247065a(28) =325947a(29) =378105
External references
- oeis: A125053