OFFSET
1,4
FORMULA
A(n,k) = (1 + (3^n - 2^(n + 1))*(6*k - 3 + 2*(-1)^n))/6, n,k >= 1.
EXAMPLE
A begins:
. 0 -1 -2 -3 -4 -5 -6 -7 -8 -9
. 1 2 3 4 5 6 7 8 9 10
. 2 13 24 35 46 57 68 79 90 101
. 41 90 139 188 237 286 335 384 433 482
. 30 209 388 567 746 925 1104 1283 1462 1641
. 501 1102 1703 2304 2905 3506 4107 4708 5309 5910
. 322 2253 4184 6115 8046 9977 11908 13839 15770 17701
. 5041 11090 17139 23188 29237 35286 41335 47384 53433 59482
. 3110 21769 40428 59087 77746 96405 115064 133723 152382 171041
. 47501 104502 161503 218504 275505 332506 389507 446508 503509 560510
MATHEMATICA
CROSSREFS
KEYWORD
sign,tabl
AUTHOR
L. Edson Jeffery, May 03 2015
STATUS
approved