A138509 Janet (or left-step) periodic table from right to left. 120 terms. 8 rows, 32 columns without spaces.

2, 1, 4, 3, 12, 11, 10, 9, 8, 7, 6, 5, 20, 19, 18, 17, 16, 15, 14, 13, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 88, 87, 86, 85, 84, 83, 82, 81, 80, 79, 78, 77, 76, 75, 74, 73, 72, 71, 70, 69, 68, 67, 66, 65, 64, 63, 62, 61, 60, 59, 58, 57, 120, 119, 118, 117, 116, 115, 114, 113, 112, 111, 110, 109, 108, 107, 106, 105, 104, 103, 102, 101, 100, 99, 98, 97, 96, 95, 94, 93, 92, 91, 90, 89

Offset

1,1

Links

Table of n, a(n) for n=1..120.

Formula

There are respectively A137583 = 2, 2, 8, 8, 18, 18, 32, 32 terms from right to left.

Mathematica

Table[Reverse@ Range[2 Ceiling[n/2]^2] + (# + 1) (3 + 2 #^2 + 4 # - 3 (-1)^#)/12 &[n - 1], {n, 8}] // Flatten (* Michael De Vlieger, Jul 20 2016 *)

Crossrefs

Cf. A137583, A168380 (first number in each row), A171710, A172002.

Sequence in context: A307365 A032662 A185413 * A099331 A260319 A146001

Adjacent sequences: A138506 A138507 A138508 * A138510 A138511 A138512

Keyword

nonn,fini,full

Author

Paul Curtz, May 10 2008

Status

approved