Number of self-avoiding closed walks (from 0 to 0) of length 2n in the strip {0, 1, 2} X Z of the square lattice Z X Z.

A022445

Number of self-avoiding closed walks (from 0 to 0) of length 2n in the strip {0, 1, 2} X Z of the square lattice Z X Z.

Terms

    a(0) =1a(1) =0a(2) =4a(3) =10a(4) =34a(5) =94a(6) =222a(7) =516a(8) =1202a(9) =2738a(10) =6110a(11) =13496a(12) =29586a(13) =64350a(14) =139006a(15) =298636a(16) =638578a(17) =1359754a(18) =2884638a(19) =6099552a(20) =12859730a(21) =27040694a(22) =56723774a(23) =118732340a(24) =248034354a(25) =517208034a(26) =1076694622a(27) =2237946376a(28) =4645007122

External references