login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A203890
Number of (n+1)X3 0..4 arrays with column and row pair sums b(i,j)=a(i,j)+a(i,j-1) and c(i,j)=a(i,j)+a(i-1,j) such that rows of b(i,j) and columns of c(i,j) are lexicographically nondecreasing
1
1940, 72423, 2634939, 77658673, 1905833494, 40229386532, 749063366121, 12535141537226, 191242521800837, 2690139305938679, 35208729581593880, 431982976092325293, 4999780614788889712, 54880725698805100992
OFFSET
1,1
COMMENTS
Column 2 of A203896
LINKS
FORMULA
Empirical: a(n) = 113*a(n-1) -6212*a(n-2) +221320*a(n-3) -5743578*a(n-4) +115686762*a(n-5) -1881637300*a(n-6) +25385784476*a(n-7) -289559900411*a(n-8) +2831744617627*a(n-9) -23990568939384*a(n-10) +177421407232548*a(n-11) -1151542770623620*a(n-12) +6581382606249668*a(n-13) -33166648415633624*a(n-14) +147244251273583720*a(n-15) -573676787225046537*a(n-16) +1945529285627436633*a(n-17) -5653175906885608140*a(n-18) +13632899209590599472*a(n-19) -25275549289365335046*a(n-20) +26996624185887539574*a(n-21) +27514801759037962500*a(n-22) -228578690691943803756*a(n-23) +648578714971495706373*a(n-24) -1104524167019935286085*a(n-25) +758125252964554137744*a(n-26) +1975099513683495197724*a(n-27) -8096734337687492730840*a(n-28) +14475306425401821863736*a(n-29) -10311204158778679293840*a(n-30) -18886510494399069305232*a(n-31) +71910030987170161382661*a(n-32) -104927385446792767549173*a(n-33) +34709702765526406135908*a(n-34) +183459840233517980554824*a(n-35) -427790462178686912054598*a(n-36) +383661619584704028435894*a(n-37) +204989717108233906841748*a(n-38) -1090893106593272569491708*a(n-39) +1386914265547499843827191*a(n-40) -249704725847759373400407*a(n-41) -1929579273401741622417144*a(n-42) +3180927203312421179741532*a(n-43) -1543693952335729850412612*a(n-44) -2440289534025257195083836*a(n-45) +5242368207399176480073192*a(n-46) -3449425978780042805424216*a(n-47) -2171357608986362083588347*a(n-48) +6496764791131381439919147*a(n-49) -4990946217417066840150228*a(n-50) -1220325548656901202637440*a(n-51) +6153168224365712029228518*a(n-52) -5193673082976535010782038*a(n-53) -187355555971944419763044*a(n-54) +4448192121060076655732812*a(n-55) -4015656326744395267126273*a(n-56) +395195160456728617610753*a(n-57) +2413130348445486514245984*a(n-58) -2319754896370509655523100*a(n-59) +463193173391849568471520*a(n-60) +945494753528095019680000*a(n-61) -988768347210022251948544*a(n-62) +284984967876914601192704*a(n-63) +246176108235756043694592*a(n-64) -300578715380273875862016*a(n-65) +113324841332324381630464*a(n-66) +33087180491340983842816*a(n-67) -60518872350391493066752*a(n-68) +29085791185688298045440*a(n-69) -1287370776372728168448*a(n-70) -6682427627908260888576*a(n-71) +4328817508217561481216*a(n-72) -1164504819226908229632*a(n-73) -123893897873735024640*a(n-74) +255898088117161426944*a(n-75) -123071804852448264192*a(n-76) +36109768027715665920*a(n-77) -7151361123252436992*a(n-78) +945308745791963136*a(n-79) -76179162229899264*a(n-80) +2853152143441920*a(n-81) for n>88
EXAMPLE
Some solutions for n=4
..4..4..4....1..1..1....2..3..1....1..2..4....0..3..1....1..0..1....3..0..3
..4..4..4....0..4..4....3..2..4....3..3..3....1..2..4....2..3..4....0..3..2
..4..4..4....2..3..3....2..3..3....2..4..4....3..4..3....2..4..1....2..1..4
..4..4..4....4..4..4....3..2..4....3..4..3....3..4..3....2..4..1....2..4..0
..4..4..4....4..4..4....1..4..2....3..4..3....3..4..3....3..4..1....4..4..4
CROSSREFS
Sequence in context: A259513 A202529 A236714 * A200656 A201047 A269039
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 07 2012
STATUS
approved