a(n,k) tabl head (triangle) for A136656: L(2;n,k) generalized (signed) Lah triangle. Called C(n,k;s=-2) in the quoted Charalambides reference. n\k 0 1 2 3 4 5 6 7 8 9 ... 0 1 0 0 0 0 0 0 0 0 0 1 0 -2 0 0 0 0 0 0 0 0 2 0 6 4 0 0 0 0 0 0 0 3 0 -24 -36 -8 0 0 0 0 0 0 4 0 120 300 144 16 0 0 0 0 0 5 0 -720 -2640 -2040 -480 -32 0 0 0 0 6 0 5040 25200 27720 10320 1440 64 0 0 0 7 0 -40320 -262080 -383040 -199920 -43680 -4032 -128 0 0 8 0 362880 2963520 5503680 3764880 1142400 163968 10752 256 0 9 0 -3628800 -36288000 -82978560 -71245440 -28092960 -5564160 -564480 -27648 -512 . . . The unsigned row sums give A136658: [1, 2, 10, 68, 580, 5912, 69784, 933200, 13912336, 228390560, 4088594464....] The unsigned column k sequences divided by 2^k are A001710, A136659, A136660, A136661 for k=1..4. ####################################### e.o.f. #####################################################