Irregular triangle: p(k, x) = 2*x*p(k-1, x) + (1 - x^2)*p(k-2, x) for even k, p(k, x) = 2*(k-1)*p(k-1, x) - x*p(k-2, x) for odd k.
A123242
Irregular triangle: p(k, x) = 2*x*p(k-1, x) + (1 - x^2)*p(k-2, x) for even k, p(k, x) = 2*(k-1)*p(k-1, x) - x*p(k-2, x) for odd k.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =4a(7) =7a(8) =3a(9) =1a(10) =10a(11) =14a(12) =4a(13) =-1a(14) =8a(15) =76a(16) =105a(17) =29a(18) =-8a(19) =1a(20) =26a(21) =165a(22) =204a(23) =43a(24) =-20a(25) =1a(26) =12a(27) =304a(28) =1904a(29) =2343
External references
- oeis: A123242