Irregular triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the n-Apollonian network.

A289722

Irregular triangle read by rows: T(n,k) is the number of unordered pairs of nodes at distance k in the n-Apollonian network.

Terms

    a(0) =6a(1) =15a(2) =6a(3) =42a(4) =72a(5) =6a(6) =123a(7) =522a(8) =258a(9) =366a(10) =2970a(11) =3894a(12) =396a(13) =1095a(14) =14838a(15) =37332a(16) =13680a(17) =216a(18) =3282a(19) =68736a(20) =278490a(21) =224928a(22) =24624a(23) =9843a(24) =303918a(25) =1779678a(26) =2517228a(27) =754704a(28) =22032a(29) =29526

External references