A264586 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 1,0 0,-1 1,2 or -1,1.

0, 4, 4, 28, 97, 333, 1380, 4497, 16712, 61820, 220148, 817438, 2928108, 10697750, 38920136, 141054653, 514441936, 1866146690, 6788624488, 24686203092, 89672098757, 326220334103, 1185345202297, 4309679482381, 15667708119546

Offset

1,2

Comments

Row 3 of A264583.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..1..2..3..4..8....1..5..3..4..8....1..2..3..4..8....1..2..3..4..8
..6.10..0..9.13....0.10..2..9.13....0.10.11..9.13....6.10..0.12.13
.11.15..5.14..7...11.15..7..6.18....5.15..7..6.18....5.15..7.17..9
.16.17.18.19.12...16.17.12.19.14...16.17.12.19.14...16.11.18.19.14

Crossrefs

Cf. A264583.

Sequence in context: A272040 A338672 A065237 * A348635 A307499 A111723

Adjacent sequences: A264583 A264584 A264585 * A264587 A264588 A264589

Keyword

nonn

Author

R. H. Hardin, Nov 18 2015

Status

approved