T(n,k) = [x^k] Product_{m=1..n} d/dx Sum_{i=1..m} x^i; triangle read by rows, n >= 0, 0 <= k <= A161680(n).
A139769
T(n,k) = [x^k] Product_{m=1..n} d/dx Sum_{i=1..m} x^i; triangle read by rows, n >= 0, 0 <= k <= A161680(n).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =1a(5) =4a(6) =7a(7) =6a(8) =1a(9) =6a(10) =18a(11) =36a(12) =49a(13) =46a(14) =24a(15) =1a(16) =8a(17) =33a(18) =94a(19) =204a(20) =354a(21) =497a(22) =562a(23) =501a(24) =326a(25) =120a(26) =1a(27) =10a(28) =52a(29) =188
External references
- oeis: A139769