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 A190152 Triangle of binomial coefficients binomial(3*n-k,3*n-3*k). 6
 1, 1, 1, 1, 10, 1, 1, 28, 35, 1, 1, 55, 210, 84, 1, 1, 91, 715, 924, 165, 1, 1, 136, 1820, 5005, 3003, 286, 1, 1, 190, 3876, 18564, 24310, 8008, 455, 1, 1, 253, 7315, 54264, 125970, 92378, 18564, 680, 1, 1, 325, 12650, 134596, 490314, 646646, 293930, 38760, 969, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 COMMENTS From R. J. Mathar, Mar 15 2013: (Start) The matrix inverse starts   1;   -1,1;   9,-10,1;   -288,322,-35,1;   22356,-25003,2730,-84,1;   -3428973,3835026,-418825,12936,-165,1;   914976405,-1023326973,111759115,-3452449,44187,-286,1;   ... (End) LINKS Nathaniel Johnston, Rows n = 0..100, flattened EXAMPLE Triangle begins:   1   1, 1   1, 10, 1   1, 28, 35, 1   1, 55, 210, 84, 1   1, 91, 715, 924, 165, 1   1, 136, 1820, 5005, 3003, 286, 1   1, 190, 3876, 18564, 24310, 8008, 455, 1   1, 253, 7315, 54264, 125970, 92378, 18564, 680, 1   ... MATHEMATICA Flatten[Table[Binomial[3n - k, 3n - 3k], {n, 0, 9}, {k, 0, n}]] PROG (Maxima) create_list(binomial(3*n-k, 3*n-3*k), n, 0, 9, k, 0, n); (PARI) for(n=0, 10, for(k=0, n, print1(binomial(3*n-k, 3*(n-k)), ", "))) \\ G. C. Greubel, Dec 29 2017 CROSSREFS Cf. A000447 (first subdiagonal), A053135 (second subdiagonal), A060544 (second column), A190088, A190153 (row sums), A190154 (diagonal sums). Sequence in context: A159041 A154979 A146765 * A154984 A173047 A173045 Adjacent sequences:  A190149 A190150 A190151 * A190153 A190154 A190155 KEYWORD nonn,easy,tabl AUTHOR Emanuele Munarini, May 05 2011 STATUS approved

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Last modified May 12 10:44 EDT 2021. Contains 343821 sequences. (Running on oeis4.)