Triangle T(n,k) read by rows given by [0, 1, 3, 6, 10, 15, 21, ...] DELTA [1, 3, 6, 10, 15, 21, 28,...] where DELTA is the operator defined in A084938.

A087736

Triangle T(n,k) read by rows given by [0, 1, 3, 6, 10, 15, 21, ...] DELTA [1, 3, 6, 10, 15, 21, 28,...] where DELTA is the operator defined in A084938.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =4a(6) =0a(7) =4a(8) =23a(9) =34a(10) =0a(11) =34a(12) =249a(13) =606a(14) =496a(15) =0a(16) =496a(17) =4354a(18) =14181a(19) =20434a(20) =11056a(21) =0a(22) =11056a(23) =112238a(24) =450097a(25) =894838a(26) =885032a(27) =349504a(28) =0a(29) =349504

External references