Number of self-avoiding walks on square lattice trapped after n steps.

Terms

a(0) =1a(1) =2a(2) =11a(3) =25a(4) =95a(5) =228a(6) =752a(7) =1860a(8) =5741a(9) =14477a(10) =42939a(11) =109758a(12) =317147a(13) =818229a(14) =2322512a(15) =6030293a(16) =16900541a(17) =44079555a(18) =122379267a(19) =320227677a(20) =882687730a(21) =2315257359a(22) =6346076015a(23) =16675422679a(24) =45502168379a(25) =119728011251a(26) =325510252108a(27) =857400725204