Triangle read by rows: T(n, k) = S2[3,1](n, k)*k! with the Sheffer triangle S2[3,1] = (exp(x), exp(3*x) -1) given in A282629.
A284861
Triangle read by rows: T(n, k) = S2[3,1](n, k)*k! with the Sheffer triangle S2[3,1] = (exp(x), exp(3*x) -1) given in A282629.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =1a(4) =15a(5) =18a(6) =1a(7) =63a(8) =216a(9) =162a(10) =1a(11) =255a(12) =1890a(13) =3564a(14) =1944a(15) =1a(16) =1023a(17) =14760a(18) =52650a(19) =68040a(20) =29160a(21) =1a(22) =4095a(23) =109458a(24) =659340a(25) =1516320a(26) =1487160a(27) =524880a(28) =1a(29) =16383
External references
- oeis: A284861