Triangle T(n, k) read by rows; given by [1, 2, 3, 4, 5, 6, ..] DELTA [1, 4, 9, 16, 25, 36, ...] where DELTA is the operator defined in A084938.

A086872

Triangle T(n, k) read by rows; given by [1, 2, 3, 4, 5, 6, ..] DELTA [1, 4, 9, 16, 25, 36, ...] where DELTA is the operator defined in A084938.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =8a(5) =5a(6) =15a(7) =75a(8) =121a(9) =61a(10) =105a(11) =840a(12) =2478a(13) =3128a(14) =1385a(15) =945a(16) =11025a(17) =51030a(18) =115350a(19) =124921a(20) =50521a(21) =10395a(22) =166320a(23) =1105335a(24) =3859680a(25) =7365633a(26) =7158128a(27) =2702765

External references