The Riordan square of the double factorial of odd numbers. Triangle T(n, k), 0 <= k <= n, read by rows.
A321627
The Riordan square of the double factorial of odd numbers. Triangle T(n, k), 0 <= k <= n, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =3a(4) =4a(5) =1a(6) =15a(7) =21a(8) =7a(9) =1a(10) =105a(11) =144a(12) =48a(13) =10a(14) =1a(15) =945a(16) =1245a(17) =372a(18) =84a(19) =13a(20) =1a(21) =10395a(22) =13140a(23) =3357a(24) =726a(25) =129a(26) =16a(27) =1a(28) =135135a(29) =164745
External references
- oeis: A321627