Number of (undirected) paths in the n-web graph.

Terms

a(0) =285a(1) =984a(2) =2855a(3) =7488a(4) =18431a(5) =43504a(6) =99783a(7) =224280a(8) =496727a(9) =1087992a(10) =2362607a(11) =5095216a(12) =10926255a(13) =23318880a(14) =49563959a(15) =104972328a(16) =221623847a(17) =466594600a(18) =979869471a(19) =2053083648a(20) =4292838335a(21) =8958997584a(22) =18664612775a(23) =38822433208a(24) =80631250551a(25) =167235234264a(26) =346415895503