Cyclops triangular numbers.

Terms

a(0) =0a(1) =105a(2) =406a(3) =703a(4) =903a(5) =11026a(6) =13041a(7) =14028a(8) =15051a(9) =27028a(10) =36046a(11) =41041a(12) =43071a(13) =46056a(14) =61075a(15) =66066a(16) =75078a(17) =77028a(18) =83028a(19) =85078a(20) =93096a(21) =1110795a(22) =1130256a(23) =1160526a(24) =1180416a(25) =1250571a(26) =1290421a(27) =1330896a(28) =1350546a(29) =1360425