Number of 3D walks of type bcc.

Terms

a(0) =1a(1) =2a(2) =8a(3) =30a(4) =138a(5) =620a(6) =3060a(7) =14910a(8) =76650a(9) =390852a(10) =2063376a(11) =10832052a(12) =58264668a(13) =312123240a(14) =1702423008a(15) =9256786110a(16) =51036229530a(17) =280696824980