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a(n) is the exponent of 2 in the denominator of the probability P(n) of the occurrence of a 3-dimensional self-trapping walk of length n.
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%I #8 Dec 15 2024 12:11:20

%S 0,0,1,2,8,11,14,15,20

%N a(n) is the exponent of 2 in the denominator of the probability P(n) of the occurrence of a 3-dimensional self-trapping walk of length n.

%D See under A077818.

%F P(n) = A077818(n) / ( 5^(n-1) * 3^A077819(n) * 2^a(n) ).

%e See under A077818.

%Y Cf. A077818, A077819, A377161, A377162, A378903.

%K nonn,frac,more

%O 11,4

%A _Hugo Pfoertner_, Nov 17 2002