Number of 7-step self-avoiding walks on an n X n square summed over all starting positions.

Terms

a(0) =0a(1) =0a(2) =112a(3) =1248a(4) =4152a(5) =8752a(6) =14932a(7) =22672a(8) =31972a(9) =42832a(10) =55252a(11) =69232a(12) =84772a(13) =101872a(14) =120532a(15) =140752a(16) =162532a(17) =185872a(18) =210772a(19) =237232a(20) =265252a(21) =294832a(22) =325972a(23) =358672a(24) =392932a(25) =428752a(26) =466132a(27) =505072a(28) =545572a(29) =587632