Numbers obtained by alternatively adding centered pentagonal layers of 5*(2^n-1) and 5*(3^n-1) elements.

A276917

Numbers obtained by alternatively adding centered pentagonal layers of 5*(2^n-1) and 5*(3^n-1) elements.

Terms

    a(0) =1a(1) =6a(2) =16a(3) =31a(4) =71a(5) =106a(6) =236a(7) =311a(8) =711a(9) =866a(10) =2076a(11) =2391a(12) =6031a(13) =6666a(14) =17596a(15) =18871a(16) =51671a(17) =54226a(18) =152636a(19) =157751a(20) =452991a(21) =463226a(22) =1348956a(23) =1369431a(24) =4026631a(25) =4067586a(26) =12039196a(27) =12121111a(28) =36035951a(29) =36199786

External references