Symmetric triangle, read by rows of 2*n+1 terms, similar to triangle A008301. Second term 5 times first term.
A126155
Symmetric triangle, read by rows of 2*n+1 terms, similar to triangle A008301. Second term 5 times first term.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =1a(4) =7a(5) =35a(6) =55a(7) =35a(8) =7a(9) =139a(10) =695a(11) =1195a(12) =1415a(13) =1195a(14) =695a(15) =139a(16) =5473a(17) =27365a(18) =48145a(19) =63365a(20) =69025a(21) =63365a(22) =48145a(23) =27365a(24) =5473a(25) =357721a(26) =1788605a(27) =3175705a(28) =4343885a(29) =5126905
External references
- oeis: A126155