Triangle T(n,k), 0<=k<=n, read by rows, given by [1,2,3,4,5,6,7,8,9,10,...] DELTA [1,1,6,6,15,15,28,28,...] where DELTA is the operator defined in A084938 .

A130847

Triangle T(n,k), 0<=k<=n, read by rows, given by [1,2,3,4,5,6,7,8,9,10,...] DELTA [1,1,6,6,15,15,28,28,...] where DELTA is the operator defined in A084938 .

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =5a(5) =2a(6) =15a(7) =42a(8) =37a(9) =10a(10) =105a(11) =450a(12) =699a(13) =458a(14) =104a(15) =945a(16) =5775a(17) =13845a(18) =16065a(19) =8866a(20) =1816a(21) =10395a(22) =85995a(23) =293265a(24) =522345a(25) =506028a(26) =248660a(27) =47312

External references