Principal diagonal of the convolution array A213773.

Terms

a(0) =1a(1) =23a(2) =102a(3) =274a(4) =575a(5) =1041a(6) =1708a(7) =2612a(8) =3789a(9) =5275a(10) =7106a(11) =9318a(12) =11947a(13) =15029a(14) =18600a(15) =22696a(16) =27353a(17) =32607a(18) =38494a(19) =45050a(20) =52311a(21) =60313a(22) =69092a(23) =78684a(24) =89125a(25) =100451a(26) =112698a(27) =125902a(28) =140099a(29) =155325