Number of balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing).
A019298
Number of balls in pyramid with base either a regular hexagon or a hexagon with alternate sides differing by 1 (balls in hexagonal pyramid of height n taken from hexagonal close-packing).
Terms
- a(0) =0a(1) =1a(2) =4a(3) =11a(4) =23a(5) =42a(6) =69a(7) =106a(8) =154a(9) =215a(10) =290a(11) =381a(12) =489a(13) =616a(14) =763a(15) =932a(16) =1124a(17) =1341a(18) =1584a(19) =1855a(20) =2155a(21) =2486a(22) =2849a(23) =3246a(24) =3678a(25) =4147a(26) =4654a(27) =5201a(28) =5789a(29) =6420
External references
- oeis: A019298