Irregular triangle read by rows: T(n, k) is the number of k X k matrices using all the integers from 1 to k^2 and having trace equal to n, with 1 <= k <= A003056(n).
A362209
Irregular triangle read by rows: T(n, k) is the number of k X k matrices using all the integers from 1 to k^2 and having trace equal to n, with 1 <= k <= A003056(n).
Terms
- a(0) =1a(1) =0a(2) =0a(3) =4a(4) =0a(5) =4a(6) =0a(7) =8a(8) =0a(9) =4a(10) =4320a(11) =0a(12) =4a(13) =4320a(14) =0a(15) =0a(16) =8640a(17) =0a(18) =0a(19) =12960a(20) =0a(21) =0a(22) =17280a(23) =11496038400a(24) =0a(25) =0a(26) =21600a(27) =11496038400a(28) =0a(29) =0
External references
- oeis: A362209