Seaweeds(n): number of n-step self-avoiding walks on upper two quadrants grid starting at origin.

A116903

Seaweeds(n): number of n-step self-avoiding walks on upper two quadrants grid starting at origin.

Terms

    a(0) =1a(1) =3a(2) =7a(3) =19a(4) =49a(5) =131a(6) =339a(7) =899a(8) =2345a(9) =6199a(10) =16225a(11) =42811a(12) =112285a(13) =296051a(14) =777411a(15) =2049025a(16) =5384855a(17) =14190509a(18) =37313977a(19) =98324565a(20) =258654441a(21) =681552747a(22) =1793492411a(23) =4725856129a(24) =12439233695a(25) =32778031159a(26) =86295460555a(27) =227399388019a(28) =598784536563

External references