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A252414 Number of (7+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7 1
1529, 10129, 50675, 113146, 762761, 3896844, 8765249, 58862703, 301012112, 677233859, 4545779778, 23255945341, 52314474379, 351180950068, 1797126206932, 4041826927867, 27135921895919, 138904307192182, 312336354848626 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 7 of A252407

LINKS

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

FORMULA

Empirical: a(n) = 155*a(n-3) -5730*a(n-6) -42198*a(n-9) +1622879*a(n-12) +2030179*a(n-15) -187657035*a(n-18) +329658691*a(n-21) +10540844124*a(n-24) -43470613344*a(n-27) -231395084395*a(n-30) +1705391090763*a(n-33) -1594780828281*a(n-36) -8202243837085*a(n-39) +13649139340934*a(n-42) +11408920742626*a(n-45) -29209549804863*a(n-48) -304063398727*a(n-51) +24481787927247*a(n-54) -9525504172387*a(n-57) -6487954567720*a(n-60) +5786348853028*a(n-63) -1143496074997*a(n-66) -870646129079*a(n-69) +657803408582*a(n-72) -2585391262*a(n-75) -95561243336*a(n-78) +6093576096*a(n-81) +5181361248*a(n-84) -76463712*a(n-87) -25142400*a(n-90) for n>91

EXAMPLE

Some solutions for n=4

..2..2..3..2..2..0....3..2..2..3..2..2....0..2..2..3..2..2....0..2..2..0..2..2

..1..3..3..1..3..3....2..3..2..2..0..2....2..3..2..2..3..2....3..1..3..3..1..3

..2..3..2..2..3..2....3..3..1..3..3..1....3..0..1..3..3..1....2..2..3..2..2..3

..2..2..3..2..2..3....3..2..2..3..2..2....3..2..2..3..2..2....3..2..2..0..2..2

..1..3..3..1..3..3....2..3..2..2..3..2....2..3..2..2..0..2....3..1..3..3..1..0

..2..0..2..2..3..2....3..0..1..3..3..1....3..3..1..3..3..1....2..2..3..2..2..3

..2..2..3..2..2..3....3..2..2..3..2..2....3..2..2..3..2..2....3..2..2..3..2..2

..1..3..3..1..3..3....2..3..2..2..0..2....2..3..2..2..3..2....3..1..3..3..1..0

..2..0..2..2..3..2....3..3..1..3..3..1....3..3..1..3..3..1....2..2..0..2..2..3

CROSSREFS

Sequence in context: A226700 A226701 A235170 * A333721 A030061 A122707

Adjacent sequences:  A252411 A252412 A252413 * A252415 A252416 A252417

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified April 17 03:58 EDT 2021. Contains 343059 sequences. (Running on oeis4.)