W. Lang, Nov 09 2007 a(n,m) tabl head (triangle) for A035324 n\m 1 2 3 4 5 6 7 8 9 10... 1 1 0 0 0 0 0 0 0 0 0 2 3 1 0 0 0 0 0 0 0 0 3 10 6 1 0 0 0 0 0 0 0 4 35 29 9 1 0 0 0 0 0 0 5 126 130 57 12 1 0 0 0 0 0 6 462 562 312 94 15 1 0 0 0 0 7 1716 2380 1578 608 140 18 1 0 0 0 8 6435 9949 7599 3525 1045 195 21 1 0 0 9 24310 41226 35401 19044 6835 1650 259 24 1 0 10 92378 169766 161052 97954 40963 12021 2450 332 27 1 . . . The first column gives A001700(n-1): [1,3,10,35,126,462,1716,6435,24310,92378,...]. The row sums gives A049027: [1,4,17,74,326,1446,6441,28770,128750,576944,...]. The alternating row sums gives A000108(n), n>=1, (Catalan numbers) [1,2,5,14,42,132,429,1430,4862,16796,..,]. ###################################### e.o.f. #################################################