P_n(k) with P_0(z) = z+1 and P_n(z) = z + P_(n-1)(z)*(P_(n-1)(z)-z) for n>1; square array P_n(k), n>=0, k>=0, read by antidiagonals.

A177888

P_n(k) with P_0(z) = z+1 and P_n(z) = z + P_(n-1)(z)*(P_(n-1)(z)-z) for n>1; square array P_n(k), n>=0, k>=0, read by antidiagonals.

Terms

    a(0) =1a(1) =2a(2) =1a(3) =3a(4) =3a(5) =1a(6) =4a(7) =5a(8) =7a(9) =1a(10) =5a(11) =7a(12) =17a(13) =43a(14) =1a(15) =6a(16) =9a(17) =31a(18) =257a(19) =1807a(20) =1a(21) =7a(22) =11a(23) =49a(24) =871a(25) =65537a(26) =3263443a(27) =1a(28) =8a(29) =13

External references